, high quality.Durable and practical. Designed for linear motors.The GT2 pulley is used with the GT2 belt and is convenient to use.The round tooth shape ensures installation of the belt teeth.Twenty teeth are in contact with the belt, minimizing the possibility of belt slipping.GT2 Belt: Material: rubber, aluminum, metal Color: Black Length: 2mWidth: 6mm/0.23 inchPitch: GT2 GT2 Pulley:Color: Silver Diameter: 16mm/0.62 inchBore Diameter: 5mm/0.19 inchHeight: 16mm/0.62 inchGroove Width: 7mm/0.28 inchFlange: Dual Teeth: 20 Setscrews: (two per GT2 pulley) Idler Pulley: Color: Silver Diameter: 18mm/0.71 inchBore Diameter: 5mm/0.19 inchGroove Width: 7mm/0.28 inchTeeth: 20 : 1 Set (other accessories in the is not included) Package Contents:1 X GT2 belt2 X GT2 pulley2 X idler4 X twist spring1 X hex wrench4 X screwsOnly 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.