Yes4All Rubber Hex Dumbbell (Single) &ndash; 5, 10, 15, 20, 25, 30, 35, 40, 45 and 50 lbs none Imported 5 LBS SOLID CAST IRON CORE: Constructed of high-quality solid cast iron core to add more durability & stability. Will not break or bend after repeated use HEXAGONAL RUBBER HEADS: Special shape prevents rolling away from the storage place or during your floor exercise, while rubber coating reduces noise and protects your workout area NON SLIP-GRIP: Contoured textured Chrome handle minimizes hand fatigue while maximizing grip comfort and controlling VERSATILE WORKOUT: Great to use in any fitness class or program to tone and sculpt your arms, shoulders & back, including cardio for higher intensity. Used for Alternated Biceps Curl, Triceps Kickback, Lateral Raise, Stationery Lunge LIFETIME WARR - 60 DAY RETURN: We offer a limited lifetime warr and 60 day return on the structural integrity under normal use Improve cardiovascular health Increase muscle mass Burn calories by raising heart rate Increase bone density, decrease risk of fracture Improve muscular endurance