Ivanko Pro-Style Economy Black Painted Plate with Cast Iron End Cap Dumbbells - 5-50 lb. Set. Great value economy dumbbell set. 5 lb. increments Grade II, ductile cast iron, painted plates with machined hole. Chrome 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.