This high quality kettle bell is manufactured with 100% cast iron, NO CHEAP FILLERS, for a durable weight.  The ergonomic design provide a very comfortable grip.  Beware of cheaper quality kettle bells with sharp handles, internal fillers and poor coatings.  The base of this is dipped in 100% virgin vinyl, to prevent damage to your floors or surfaces when setting them down.  These are great for a high end home gym or commercial gym.  They are great for various exercises and will be an excellent addition to your fitness/strength training routine.