COMPETITIVE STEEL KETTLEBELLS 3pcs SET Morgan Pro-Grade Kettlebells are much like bumper plates in their configuration and consistency of design. Across the entire weight range, you'll find a Pro-Grade Kettlebell is the exact same size as any other in the range. The weight is altered by adding lead ballast to the interior, although the shell should most definitely be steel, steel, and only steel (painted though right). Its easy to find cheaper Kettlebells, that are trying to be as good as these. Usually cement cast with a steel handle inserted - cracking easily when dropped, so buyer beware. We retain as much of a natural surface feel as possible, opting for rough textured industrial paint not a smooth and slippery coating. Kettlebells have been likened to a cannonball with a handle, best used to perform ballistic exercises that combine cardiovascular, strength and flexibility training. By their nature, typical kettlebell exercises build strength and endurance particularly in the lower back, legs and shoulders, as well as increase grip strength. Diameter of the handles is 35mm PACK CONSISTS OF: 1 x 8kg (pink) 1 x 12kg (blue) 1 x 16kg (yellow)