The Kettlebell is a traditional Russian cast iron weight which looks like a cannonball with a handle. 

Kettlebell workouts are intended to increase strength, endurance, agility and balance, challenging both the muscular and cardiovascular system with dynamic, total-body movements.

Made from black cast iron and sold individually in 5 lb. increments from 20 thru 60 lbs. and 70 and 80 lbs.