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. Kettlebell workouts engage multiple muscle groups at once, making kettlebells a great option for getting a whole body workout in a short time. These kettlebells are made from cement-filled PVC providing a more economical choice over traditional cast iron made kettlebells.