Ivanko Rubber Pro-Style Dumbbell Set - 5-50 lb. Set 5 lb. increments Rubber encased plate with rubber end plate and brass numbers. CDH solid #1026 steel, one piece 30mm chrome handles. Handles feature special deep-set knurling for functional performance and sure grip. Handles use special solid steel bolt, 55% bigger, 60% longer, 30% stronger. All chrome is triple-layer process with nickel base.