Mizuno 921 Hot Metal Irons Review

$750.00

Last updated on May 16, 2022 6:11 am

Check Out Our Exclusive Offers

The Mizuno JPX921 Hot Metal Iron Set is an imposing iron set that offers golfers enhanced stability, ideal impact feel, and maximum ball speed. It’s designed for golfers who prioritize precision and distance in their game. The Mizuno JPX921 Hot Metal Iron Set has received consistent customer praise and has proven to be a top choice for golfers of varying skill levels.

Paul Liberatore Paul Liberatore
May 16, 2022
Add your review
You will get: Clubfaces are the hottest Mizuno has ever produced. Cup Face Design increases ball speeds and improves turf interaction. Plenty of stock shafts and grips make fitting and customization easy.

Updated February 2024 to update current pricing information.

If you’ve read many of our equipment reviews in the past, you’ve probably noticed we’ve reviewed a lot of Mizuno’s stuff.  That’s because they make some of the finest golf equipment in the world.  A lot of our staff play their clubs, and our readers love their stuff too.

Even though the JPX921 Hot Metal Irons are a couple years old, we’ve received a lot of positive feedback about them.  So much so, that we thought we’d share what we’ve learned with the rest of you, our Golfer’s Authority Family. 

More and more golfers are switching to Mizuno irons, even though they’re traditionally known as a “player’s” brand.  That’s because the Hot Metal Line is tailored to players looking for more distance and forgiveness. 

The JPX 921s are the hottest in the line yet. .

Key Features

  • Reengineered CORETECH face is 0.2 mm thinner than the previous model and produces faster ball speeds and more distance.
  • Seamless Cup Face Design allows the face to flex more at impact for increased ball speeds.
  • Stability Frame Design puts added weight in the perimeter of the clubhead for added stability through impact.

Who Should Buy the Mizuno JPX921 Hot Metal Irons?

The JPX921 Irons incorporate all the design and tech features good players want, into a clubhead that’s meant to help mid to high handicappers get more out of their iron game.

In both robotic and human testing, these irons proved to be the hottest Mizuno has ever produced.  All the feedback we’ve received backs that claim too.  Golfers are hitting the JPX921s a lot farther than anything they’ve seen before.

In short, if you’re a mid to high handicap that’s looking for explosive distance and lots of forgiveness, the JPX921s are a sure bet.

Where to Buy
Last Amazon price update was: April 15, 2024 12:18 pm
× Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com (Amazon.in, Amazon.co.uk, Amazon.de, etc) at the time of purchase will apply to the purchase of this product.

Design and Technology

Ever since Mizuno began making golf clubs, they’ve had a reputation for making some of the sexiest looking sticks in the game. 

Aesthetically, the JPX921s definitely live up to that reputation.  At first glance, these clubs look like a far cry from a lot of other game improvement irons.  Instead of bright colors and loud logos, the Pearl-Brush Finish is clean and classic.  The finish keeps the sun out of your eyes too thanks to its anti-glare properties.

At address, these irons scream “hit me” with their large head profile, prominent top line, wide sole, and noticeable offset.  They’re certainly a far cry from the butter knife blades Mizuno’s been making for years. 

With each generation of the Hot Metal Irons, Mizuno perfects it’s Chromology design more and more.  In the JPX921s, it starts with a Coretech face that’s 0.2mm thinner than the previous iron.  You guessed it, that means faster ball speeds and more distance. 

Cup Face Design employs a variable thickness sole that allows the leading edge to act like a hinge, and the face to flex.  Yep, that spells faster ball speeds too. 

If there’s one thing Mizuno has perfected more than any other manufacturer, it’s making irons that sound and feel exquisite.  Unlike a lot of game improvement irons that sound loud and feel clunky, the JPX921s are as responsive as anything you’ll find.  That’s due to Harmonic Impact Design that features three additional sound ribs placed behind the clubface.  Both noise and vibration are dampened. 

And talk about stability.  There’s no shortage of it in the JPX921 Irons.  Compared to previous irons in the Hot Metal Line, a substantial amount of weight has been moved from the club’s center to its perimeter, with added toe-bias.  This reduces curvature on off-center strikes and lessens the amount of distance lost. 

Suffice it to say, the JPX921s employ the latest and greatest in both design and technology to help golfers hit their irons farther, higher, and more consistently.

8.8Expert Score
Mizuno 921 Hot Metal Irons Review
Mizuno JPX921 Hot Metal Irons Review

The Mizuno JPX921 Hot Metal Iron Set is an imposing iron set that offers golfers enhanced stability, ideal impact feel, and maximum ball speed. It's designed for golfers who prioritize precision and distance in their game. The Mizuno JPX921 Hot Metal Iron Set has received consistent customer praise and has proven to be a top choice for golfers of varying skill levels.

Innovation
9
Performance
9
Design/Sound/Feel
9
Value
8
PROS
  • Clubfaces are the hottest Mizuno has ever produced.
  • Cup Face Design increases ball speeds and improves turf interaction.
  • Plenty of stock shafts and grips make fitting and customization easy.
CONS
  • Price point is higher than other game improvement irons.
  • May not be the right clubs for better players looking for added control instead of more distance.
  • Some golfers say it’s taken longer than usual to adjust to new yardages when they put these clubs in their bag.
jpx921 hm tab main faster

Specs

A complete set of JPX921 irons comes with four-iron through pitching wedge.  The set is available in both right and left-handed. 

As is the case with all Mizuno irons, there’s no shortage of stock shafts to choose from.  They include:

  • KBS Tour Steel in regular, stiff, and extra stiff flex
  • Aerotech Steelfiber I110 Graphite in stiff flex
  • Aerotech Steelfiber I95 Graphite in regular and stiff flex
  • Nippon N.S. 950GH Neo Steel in regular and stiff flex
  • Nippon N.S. Pro 950GH Steel in regular and stiff flex
  • Nippon N.S. Pro Modus Tour 105 Steel in regular, stiff, and extra stiff flex
  • Nippon N.S. Pro Modus Tour 115 Steel in stiff and extra stiff flex
  • Nippon N.S. Pro Modus Tour 120 Steel in stiff and extra stiff flex
  • True Temper Dynamic Gold 105 Steel in regular and stiff flex
  • True Temper Dynamic Gold 120 Steel in stiff and extra stiff flex
  • True Temper Dynamic Gold Steel in stiff and extra stiff flex
  • True Temper Dynamic Gold Tour Issue Steel in stiff and extra stiff flex
  • True Temper Dynamic Gold X7 in extra stiff flex

There are also a number of other premium shafts available for an upcharge.

Mizuno has a plethora of grips available too. 

Our Experience

I’ve hit just about every Mizuno club in existence at some point or another.  And I’ll be the first to tell you the JPX921 Irons are the hottest they’ve ever made.  It’s not even close.

Aside from the obvious distance I hit these irons compared to other irons, what I really appreciated was their sound and feel.  Most game improvement irons lack responsiveness and sound loud at impact.  Not so with the JPX921s.  They felt as good as any forged player’s club I’ve hit in recent memory.

Aesthetically, these clubs are above par too.  Even though they’re bigger than what I’m used to, the lines are clean and the clubhead profile makes you feel like King Kong when you’re over the ball. 

I don’t have anything but high marks for these clubs.

Frequently Asked Questions

Can Left-Handed Golfers Use the Mizuno JPX921 Hot Metal Iron Set?

Yes, left-handed golfers can use the Mizuno JPX921 Hot Metal iron set. It offers grip options suitable for left-handed players, ensuring a comfortable and effective swing. The set’s design accommodates both right and left-handed golfers.

Are the Clubs in the Mizuno JPX921 Hot Metal Iron Set Customizable for Different Shaft Options?

Yes, the clubs in the Mizuno JPX921 Hot Metal Iron Set are customizable for different shaft options. They offer various fitting options, allowing for personalized adjustments to suit individual swing characteristics and preferences.

What Is the Recommended Handicap Range for Golfers to Use the Mizuno JPX921 Hot Metal Iron Set?

As a golfer, I’d suggest considering the recommended handicap range when choosing clubs. It’s vital for golfers to match their experience level with the iron set for optimal performance and improvement on the course.

Does the Mizuno JPX921 Hot Metal Iron Set Come With a Headcover for Protection?

Yes, the Mizuno JPX921 Hot Metal Iron Set does come with headcover options for protection. These iron set accessories ensure that your clubs are safeguarded when not in use, maintaining their quality and performance.

Are There Any Specific Maintenance or Care Instructions for the Mizuno JPX921 Hot Metal Iron Set?

I always keep my irons in top shape with routine cleaning and proper storage. After every round, I wipe them down with a damp cloth, and I store them in a cool, dry place.

Conclusion

Mizuno isn’t going to stop making good player’s golf clubs any time soon.  But by the looks of things, they aren’t going to stop making premium game improvement irons either.

The JPX921s are just the latest iteration to find their way into the bags of golfers around the world.  They truly are one of the foremost irons in their category.  If you haven’t hit them yet, but want more distance and forgiveness, I suggest you do. 

Videos: Mizuno 921 Hot Metal Irons Review

Paul Liberatore
Paul Liberatore

As the Founder of Golfers Authority Paul Liberatore Esq. has spent the last 7+ years writing about the best golf equipment or instruction from the top golf instructors in the world. He has been a contributing writer for Sports Illustrated Golf and GolfWRX. After graduating with honors from Purdue University, he realized that he had a passion for the golf business and the law. When he's not practicing law, or creating golf content on YouTube, he can be found on his syndicated Behind the Golf Brand podcast both on Apple and Spotify talking with the most prolific leaders in the golf industry. 

Mizuno 921 Hot Metal Irons Review
Mizuno 921 Hot Metal Irons Review

$750.00

footer
Golfers Authority
7650 S. McClintock Drive, Suite 103, #352
Tempe, AZ 85284 USA

Amazon Associates Program We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.

Golfers Authority
Logo