Body-Solid SDRS550 5-50-Pound Rubber Hex Dumbbell Set Dumbbells feature hexagonal, "no-roll" design and durable rubber finish Patent-pending Secure Dumbbell System combines one-piece cast iron heads with steel inserts that have been pinned, press-fitted, and welded Compact design makes them shorter in length and easier to work with than conventional dumbbells Set includes two each of five-, ten-, 15-, 20-, 25-, 30-, 35-, 40-, 45-, and 50-pound hexagonal dumbbells Includes limited lifetime manufacturer's warranty