Our Pro Competition Steel Kettlebells are made from steel, not cast iron and designed for international kettlebell competitions standards. The size and shape of each kettlebell from an 8kg through to a 32kg is exactly the same in comparison to a Russian style kettlebell where they increase in size as they get heavier. Each size is painted in an identifying colour so you can see the difference between weights easily. If you are looking for a full set, just give us a call and we will work you out a package price! 02 9953 4490.