Pro-Style Dumbbells come in either Virgin Rubber or Cast Iron with a Gray Hammertone finish. Featuring a 32mm, HARD Chrome Handle with a Medium Knurl. Assembled with Course Thread, Alloy Bolts and secured with locking compound. Cemco uses impact wrenches for assembly and are then torqued to 130 p.s.i. Pro-Style Dumbbells feature a Rubber Encased, Steel End Plate to ensure against cracking. Pro-Style Dumbbells come in 2.5 lb. increments up to 150 lb.