Features: 1.The pulley is used together with the belt for easy use. 2.The timing belt system scalloped contour ensures smooth belt teeth. 3.Wheels with 20 teeth or grooves are one of the best choices for 3D printer construction, minimizing the risk of belt slippage. 4.This timing belt system is designed for linear motion and precision with high positioning accuracy. 5.Durable and practical. specification:GT2 belt and pulley compatible (GT2 pulley) is a popular choice for RepRap testing. And the GT2 series belts are designed for linear motion. Using a contour with scallops, this ensures that the belt teeth enter the pulley groove perfectly and accurately, so that if the direction of the pulley is reversed, the belt cannot move in the groove. For best performance, at least 6 teeth are in contact with the pulley for a given time, which minimizes the possibility of slip rings. Durable and practical. This timing belt system is designed for linear motion and precision with high positioning accuracy. The pulley is used together with the belt for easy use. The timing belt system scalloped contour ensures smooth belt teeth. Wheels with 20 teeth or grooves are one of the best choices for 3D printer construction, minimizing the risk of belt slippage. : Type: Printer Accessories Kit GT2 Belt: Length:about 10m Width: about 6mm Material: Rubber Colour: Black GT2 Pulley: Hole: 5mm Diameter: 16 mm Hole: 5mm Size: 16 mm Teeth: 20 Material: Aluminum Color: Silver Wrench: Material: Aluminum Color: Silver Package list: 1 * 10m Timing Belt(6mm) 10 * 20-teeth 5mm Synchronous Wheels 2 * Wrenches Note: 1. Do not fold the product, so as not to damage the skeleton material, which will have a negative impact on the strength of the timing belt. 2. Avoid contact with chemicals (especially strong oxidizing acids such as concentrated sulfuric acid, etc.). 3. Avoid long-term exposure to oil and water. 4. When replacing the timing belt, the belt cannot be removed unless the tension of the belt is reduced to a minimum level and cannot be smashed with a non-professional tool. 5. Please allow slight error due to manual measurement. Thanks for your kind understanding.