Tone Fitness Vinyl Kettlebell, 15-Pound VERSATILE  Kettle bell training engages the entire body - particularly core muscles - for a sculpted, stable and toned physique CONSTRUCTION - Vinyl covered, cement filled kettlebells offer an economical choice over the traditional cast iron kettlebells FUNCTIONAL  Perfect for swings, deadlifts, squats, get-ups, snatches and other athletic or cross training workouts CHOICES  This kettlebell group from Tone Fitness is available in sizes from 5, 10, and 15 pounds