ITEM NAME:Aluminum GT2 36 Teeth 8mm Bore Timing Belt Pulley Flange Synchronous Wheel B6Z2 Aluminum GT2 36 Teeth 8mm Bore Timing Belt Pulley Flange Synchronous Wheel B6Z2 Material: Aluminum; Durable and virtually. Teeth: 36T; Bore: 8mm; Total Size: 25.5*25.5*17mm(L*W*H) Suits to the timing belt which is 6mm width. 36 contact with the tooth side which minimizes the risk of the belt slipping color: silver This synchronous aluminum belt pulley is for 3D printer. Package Content: 1 X GT2 8mm Bore Timing Pulley Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.