Perform Better First Place Gravity Cast Iron Kettlebell, 4 kg Off-centered weight of kettlebells increases the demand placed on core stabilization, agility, and proprioception Durable cast iron with a rubber, non-skid bottom Kettlebells work the body across a wide range of angles Use for squats, throws, cleans, jerks, snatches, rotational swings and more Portable - heavy yet compact - available in 22 sizes/weights