Competition kettlebells are made of steel and are all the same size regardless of weight for a uniform training experience at all times. These competition kettlebells have 35mm handles. 

kettlebells need to be created with a flat base for easy storage and use during floor workouts, kettlebells without flat bases will roll around which makes it hard to store and use during movements like pushups, rows and renegade rows

HIGH-QUALITY CAST IRON WITH VINYL COATED FINISH: Each kettlebell is encased with color-coded vinyl to prevent corrosion, increase durability, reduce noise, protect flooring and enhance appearance