A Colorful Vinyl Cast Iron Kettlebell is a piece of exercise equipment that improves cardiovascular well being and builds muscle with appropriate use. The kettlebell is a cast-iron or cast steel weight used to perform ballistic exercises that combine cardiovascular, strength and flexibility training. They are also the primary equipment used in the weight lifting sport. Easy to grasp iron handle, rock layer. And cast iron inner core high strength long life. Beautiful and not damage the floor, safe and reliable.