Details: Dumbbells are used 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. Dumbbells are perfect for isolations, full body, functional and HIIT workouts. The CAP PVC Coated Dumbbell heads are made from ASTM A48 Class 20 grey iron and coated in 90 shore hardness PVC joined together by a solid 1018 cold rolled steel chromed handle.