The Iron-Strength Cast Iron Kettlebell is a cast iron or cast steel ball with a handle attached to the top (resembling a cannonball with a handle). It is used to perform many types of exercises, including ballistic exercises that combine cardiovascular, strength and flexibility training. They are also the primary equipment used in the weight lifting sport of kettlebell lifting. Offers a chance to work out broad range of muscle groups. Constructed from a hard wearing vinyl coating.