Crank up your workout with a pair of XMark 20 lb. Commercial Rubber Round Dumbbells. Featuring heavy duty, odorless premium rubber, XMark’s Rubber Round Dumbbells are the key to building lean, powerful muscles without scratching your floors or equipment. Designed with ergonomic handles to reduce hand fatigue while maximizing comfort, XMark’s dumbbells are perfect for shaping arms, chest, back, abs and legs. Perform numerous exercises from bicep curls to shoulder presses, squats to lunges and so much more with XMark, the mark of excellence.