1. The system is an extension of the system with greater load-carryingcapacity. was developed for high torque drive applications, but is not acceptable for most precision indexing or registration applications. 2. As smaller diameter pulleys are used, the clearance required to operate properly is increased. drive clearance, using small diameter pulleys, is approximately four times an equivalent timing belt drive. 3. Circular arc tooth profile, tooth space is small, suitable for straight line driving. Colour:Red Material:Aluminum Alloy Package Contents: 2 * Synchronous Pulley With installation accessories(The color of the installation accessories is random and cannot be specified) Only the above package content, other products are not included. Note: Light reflection 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.