CAP's Rubber Coated Cast Iron Hex Dumbbells can be used for both the upper body and lower body to strengthen all muscle groups. The hexagon shape of these dumbbells are designed to prevent the dumbbells from rolling, as well as provide easier storage. Each dumbbell is coated in rubber to help protech floors and equipment. Made of solid cast iron w/ steel handles. Set includes a pair of 5 to 25 lb dumbbells in 5 lb increments for a total of 150 lbs.