Description: Smooth movement,small noise. High printing precision. The structure of the V type is simple and portable. The speed of printing can be greatly improved. Low cost, easy to install, and maintain, etc. Specification: Color: Black+Silver Material: Nylon Plastic Machining error: within 0.005mm Suitable: for 3D Printer Package Includes: 1x625ZZ Bearing with V Shape Pulley Wheel