The CAP Barbell Cast Iron Hex Dumbbell offers dependability and long-lasting performance. Use a cast iron dumbbell to exercise all major muscle groups, including arms, chest, back, abs, legs and core. The benefits of dumbbell exercises include muscle building, improving core strength, boosting balance, providing better bone health, burning calories, increasing energy levels, enhancing overall mood and more. Built to last, these dumbbell heads are made from Class 20 grey iron and joined together by a cold rolled solid steel handle (sizes 1-120 pounds) finished with a durable industrial enamel coating. The CAP Original Cast Iron Hex Dumbbell Weights have hex shaped heads to prevent rolling. Each sold individually.