1、The pulley is made of high quality aluminum material: Durable and practical. 2、2M Timing Belt: Designed for linear motors. 3、The scalloped shape ensures smooth installation of the belt teeth. 4、20 teeth are in contact with the belt, minimizing the possibility of belt slippage. 5、The product is used on 3d printers and engraving machines. Features: The pulley is made of high quality aluminum material: Durable and practical. 2M Timing Belt: Designed for linear motors. The scalloped shape ensures smooth installation of the belt teeth. 20 teeth are in contact with the belt, minimizing the possibility of belt slippage. The product is used on 3d printers and engraving machines.   Specification: Belt Belt Name: GT2 Length: approx. 2m / 6.6ft Spacing: approx. 2mm / 0.1inch Width: approx. 6mm / 0.2inch Pulley Material: aluminum Teeth: 20 Teeth spacing: approx. 2mm / 0.1inch Teeth width: approx. 7mm / 0.3inch Inner hole: 8mm / 0.3inch   Package List: 1 * Timing belt 4 * Synchronous wheel