The Mizuno Jpx 919 came out in September of 2018 while the newer version the Mizuno JPX 921 tour came out in September of 2020. These irons are the same irons that Brooks Koepka used to win all 4 of his major wins. They are a great set for anyone looking for added forgiveness to a blade. , The Mizuno JPX 919 iron sets were a part of their 2019 releases. The irons were first shown in late 2018 and were first available in February of 2019. The same applied for JPX 921 (2021). The JPX 921 iron sets were released for preorder in late 2020 and first became available in 2021. , The [Mizuno JPX921 Tour Iron Set](https://www.curated.com/sellable/AgAAADAAHhM9sHcZSd-R6_RKfYcsdg) was designed for low-handicap players demanding lower ball speeds with higher spin rates, and a soft forged feel along with precision and stability from slight mishits. The [Mizuno JPX921 Tour](https://www.curated.com/sellable/AgAAADAAHhM9sHcZSd-R6_RKfYcsdg) was released in 2020 and is the most played Mizuno iron by non-contracted Pros in the PGA.