Features: Durable and wear-resistant: good quality materials, it has excellent wear resistance and durability Capable of long-term quiet operation, the belt adopts a low-noise design to minimize noise during the printing process, providing a quiet working environment. Easy to install: The belt is equipped with a standard interfaces, making it easy to install on different models of 3D printers, and the operation is simple and fast. Stable time operation, reducing maintenance and replacement frequency. For Neptune 3, for Neptune 4 ;2GT-634mm Specifications: Material:Rubber Width:approx 0.6cm/0.24in Types: for X-Axis / Y-Axis Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1PC GT2 Open Timing Belt