Getty Images and USGA
Justin Rose, currently a freelance gear broker, has the freedom to play with whatever iron he chooses from week to week. Coincidentally, Rose decided to use unprecedented Mizuno Pro 221 irons at the 2021 Open Championship at Royal St. George’s Golf Club this week.
Three new Mizuno irons appeared on the USGA-compliant list earlier this week, including the Mizuno Pro 221, 223 and 225.
Judging from the USGA black and white photos, the Mizuno Pro 221 irons – Rose’s preferred irons at The Open – appear to be the most similar to traditional blade irons. The 223 irons appear to have a cavity-back design, and the 225 models have “HMB” stamped on their hosels; In the past, HMB stood for “Hot Metal Blade”, which was a replacement for long irons with a hollow body.
“GF Forged HD 1025E” is written on the hosel of the Mizuno Pro 221 irons. Based on previous Mizuno publications, these letters and numbers would stand for “Grain Flow Forged High Density 1025E”.
“Grain Flow” refers to Mizuno’s forging process, which ensures that the grains in the metals of the iron heads flow in a specific direction for better precision and a better feel. As for “1025E”, it probably refers to the type of material the heads are made of; 1025E is a type of high density carbon.
Golf equipment fans will remember that the latest Mizuno MP-20 irons had the same GF Forged HD 1025E embossing on their hosels.
What is the difference between the Mizuno Pro 221 irons and the MP-20 irons? It’s hard to tell from the photos, but it seems the muscle pad on the back of the irons looks different on the Pro 221s.
Until Mizuno officially comments on the designs, all speculation is for now. The only things we know for sure right now are 1) the irons are USGA compliant and 2) they are in Rose’s pocket as he wants to win the Open this week. Rose is currently sitting at T25 (three under par) through two rounds at Royal St. George’s.
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