IUKL competition rule. Athlete Classification category.
Men's Professional tier kettlebell weights: MSIC / Professional I uses 32kg for Biathlon, Long Cycle, and Snatch. MS / Professional II uses 32kg. CMS / Professional III uses 28kg. Professional ranks are only available to athletes in weight classes 63kg and above.
See the interactive comparison on KETTLEBELL MONSTER™ for filterable views and more detail.