The Tone Fitness kettlebell has been redesigned for a sleeker profile and more comfortable grip. The handle has a smoother surface to allow working out without irritation to your hands. Working out with kettlebells sculpts and tones the entire body because lifting and controlling a kettlebell forces the entire body and specifically the core, to contract as a group. Kettle bell workouts engage multiple muscle groups at once, making kettle bells a great option for getting a whole body workout in a short time. These kettle bells are made from cement-filled PVC providing a more economical choice over the traditional cast iron made kettlebells.