Features: *2X GT2 Pulley 20 Teeth Bore 5mm + GT2 6mm Timing Belt & 2X Idler 4X Tension F8M6 *100% fresh and superb *Made of fine material, durable and real looking to use *Durable and practical. Designed for linear motors. *GT2 pulley is used along with GT2 belt, which is awfully convenient to use. *The scalloped shape guarantees tender set up of the belt teeth. *20 tooth in contact with the belt, minimizing the potential of belt slippage. Specification: GT2 belt: *Material: Rubber+Aluminum+Metal *Colour: Black(As images show) *Length: 2 meters(Approx.) *Width: 6mm / 0.23 inches(Approx.) *Spacing: GT2 GT2 pulley: *Color: Silver(As photographs show) *Diameter: 16mm / 0.62 inches(Approx.) *Aperture: 5mm / 0.19 inches(Approx.) *Height: 16mm / 0.62 inches(Approx.) *Groove width: 7mm / 0.28 inches(Approx.) *Flange: Double *Tooth: 20 *Fixing screw: M4 (two according to GT2 pulley) Leisure man pulley: *Color: Silver(As photographs show) *Diameter: 18mm / 0.71 inches(Approx.) *Aperture: 5mm / 0.19 inches(Approx.) *Groove width: 7mm / 0.28 inches(Approx.) *Tooth: 20 *Quantity: 1 set (other equipment in the picture are usually not included) Package Contents: 1 * Gt2 Belt 2 * Gt2 Pulleys 2 * Idlers 4 * Torsion Springs 1 * Hex Wrench 4 * Screws Note: 1.The real shade of the item could also be barely diverse from the photographs shown on website attributable to many factors corresponding to brightness of your computer screen and light brightness. 2.Please allow slight guide size deviation for the data.