1. MATERIAL: PVC coating helps to eliminate the odor associated with rubber dumbbells, it is also rust resistant for long time usage; thanks to PVC coating, you can enjoy practicing without worrying about the floor and noise on each drop 2.SOLID CAST IRON CORE FOR RELIABLE STRUCTURE: the cast iron hex dumbbell provides assistance for strength training and core development; it will not bend or break after repeated use during long period of time 3.HEXAGON DESIGN, RUBBER HANDLE: hexagonshaped heads ensure easy use during sessions; they help prevent rolling and therefore offer convenient storage; besides, the contoured textured handle has ergonomic design for a firm but comfortable feel 4.VARIOUS CHOICES FOR YOUR LEVEL: choose the right level from our wide range of hex rubber dumbbell, including 10, 15, 20, 25, 30, 35, 40, 45, 50lbs, which is sold in individual