Timing Belt: The timing belt is made of premium rubber, and flexible. It is specially designed for linear movement and high positioning accuracy. The round tooth profile ensures a perfect fit of the belt teeth. Pulley: It is used with a timing belt, very convenient to use. 20 Teeth contact with the belt reduces the risk of slipping. Locking Spring: With springs, you can add the right tension you need and make your much more precise. Locking Block: The locking block is used in open belt loops for 2GT belt (and some other models). Ensure the gearbox is firm and free from loosening. Compatibility: Compatible with most 3D printers. Caution: Small parts, keep away from children! Timing Belt: Type: Material: Rubber Shape: Open Timing Belt Length: 5m Width: 6mm Pitch: 2mm Pulley: Teeth: 20 Total Width: 16mm Bore Diameter: 5mm Groove Width: 7mm Flange: Double Material: Aluminum Sprocket: Teeth: 20 Bore Diameter: 5mm Total Width: 8.5mm Material: Aluminum Timing Belt Tensioner Spring: Material: