The Cap Barbell 30 lb Vinyl Kettlebell Set in Black includes a 5, 10 and 15 pound vinyl kettlebells. 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 work 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 cement filled providing a more economical choice over the traditional cast iron made kettle bells. Set contains 3 kettlebells in 5 lb, 10 lb, and 15 lb.