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). It's 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.
The diameter of the handles is 35mm.