York Rubber Hex 2.5-30 lb. Dumbbells 12 pairs -- 2.5 lb increments The rubber coating increases durability, protects flooring and equipment, enhances appearance, diminishes noise and is easy to clean. The heads are torque-threaded and permanently affixed to a thick 35 mm solid steel shaft improving the strength of the head/handle joint. These safe, attractive dumbbells have contoured, knurled chrome handles and durable rubber-covered heads for increased safety and comfort. The knurled chrome handles are ergonomically contoured to fit comfortably in the users' palm.