The Tone Fitness Kettlebell Body Trainer Set includes three vinyl kettlebells, an exercise chart, and a trainer DVD. The Tone Fitness kettle bell 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 kettle bells sculpts and tones the entire body because lifting and controlling a kettle bell 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 cement filled providing a more economical choice over the traditional cast iron made kettle bells. Warning: This product contains one or more phthalate chemicals known to the state of California to cause birth defects and other reproductive harm.