Reliable material: made of polycarbonate, its good abrasion resistance, flame resistance and oxidation resistance can help your 3D printer to complete the work smoothly. Wide compatibility: Suitable for V-groove aluminum materials for most DIY 3D printers, including but not limited to for Creality, for Ender 3, for Anet, etc. Excellent expressiveness: These 3D printer wheels move smoothly, with low noise and high printing accuracy, which can improve the printing speed very well. They are practical accessories for 3D printers. Packing list: You will receive a package containing 20 3D printer polycarbonate pulleys, suitable for most DIY 3D printers, with a long service life. Wide range of uses: not only mainly used for 3D printers, but also for engraving machines, hot-wire machines, lidar cutting machines, camera sliders, plasma cutting machines, robots, furniture and other DIY machines. Colour: silver Material: polycarbonate Package Contents: 20 * 3D printer polycarbonate pulleys Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.