CAP's Polyurethane Infused Dumbbells incorporate commercial gym durability with everyday use affordability. Made of solid cast iron with a protective black urethane coating. This helps prevent damage to floors and equipment. Hexagon shaped dumbbell heads are designed to prevent rolling, as well as provide easier storage. The dumbbells also come with a polyurethane infused gripping surface and chrome accents on the handles. Unlike some rubber products, there is no odor or greasy feeling with these polyurethane dumbbells. Sold as each.