It is a combination of belt transmission, chain and gear drive No , constant speed can be obtained, is stable and can vibration High transmission efficiency, structure, and also suitable for multi-axle transmission, do not need lubrication, no pollution Suitable for dishwashers, packaging machinery, motorcycles, automobile, dryer, food machinery, inkjet printer, conveyor, bonders . durable and practical specially designed for linear motion GT2 belt used pulley and GT2, comfortable to use round tooth ensures that the belt tooth fits smoothly 20 teeth contact with the Ribbon minimized, that the probability of the belt . Teeth: 16 colour:Silver+black Material:aluminum+rubber size:GT2 Belt: Length: 2m/196.85 inch Width: 6mm/0.23 inch Pitch: GT2 GT2 Pulley: Diameter: 16 mm/0.62 inch Hole Diameter: 5 mm/0.19 inch Height: 16 mm/0.62 inch Package Contents: 2x GT2 synchronous wheel 1x GT2 belt 1 X Hex Wrench Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.