Mizuno’s Big Mistake?! Mizuno JPX-919 Hot Metal Pro Irons! Mizuno JPX 919 irons have been a huge hit with high handicap golfers, low handicap golfers and professionals alike. with the JPX 919 forged, JPX 919 HOT METAL and JPX 919 tour, Mizuno pretty much had the whole market cornered for golfers of all abilities… or so we thought. introducing the brand new for 2019 Mizuno JPX 919 HOT METAL PRO irons. Are these irons the best mid handicap irons of 2019? could they even be the perfect irons for high handicappers? or best irons for beginners? lets find out… and lets do it now