Smooth transmission,:a buffer, damping capacity, low noise. Accurate transmission: without slipping at work, having a constant gear ratio GT2 Synchronous Wheel is made of premium fiber reinforeced rubber, durable and flexible 2pcs 2GT 20 Teeth Synchronous Wheel widely used in 3D printer, milling machine, gear shaper, drilling machine, CNC engine lathe etc GT2 20 Teeth Timing Pulley providing a smoother transition between belt, good performance for 3D printers Description Bore synchronous wheel is made of Aluminum Alloy, Surface oxidation treatment. Bore Diameter: 5mm.Widely used in milling machine, gear shaper, drilling machine, hobbing machine or other machinery transmission occasions. GT2 timing belt pulley system especially suited for linear movement and positioning. Feature Bore synchronous wheel -Color: As Shown. -Material:Rubber. -Size: Bore Diameter: 5mm/0.196. Length of timing belt: 200mm/7.87inch. Width of timing belt: 6mm/0.236inch. Number of tooth: 2060T. Package Including 2*2GT 20 Teeth 5mm Bore Synchronous Wheel 2*2GT 60 Teeth 5mm Bore Synchronous Wheel 2*Length 200mm Width 6mm Belt