Reliable material: made of polycarbonate, its nice wear resistance, flame retardancy and oxidation resistance can assist your 3D printer to complete its work wellBroad compatibility: it's applicable for most DIY 3D printer's V slot aluminum profile, including, but not limited for , Ender 3, Anet, etc.Nice expressiveness: these 3D printer wheels move smoothly, have low noise, have high printing accuracy, and can nicely increase the printing speed, they are useful accessories for 3D printersWide range of uses: they are not only mainly applied for 3D printers, but also for engravers, hot wire machines, laser cutters, camera sliders, plasma cutters, robotics, furniture, and other DIY machinesSize:Outer diameter: 24 mmInner diameter: 5 mmHeight: 11 mmColor: transparentMaterial: Transparent polycarbonate wheelsPackage Contents:16 x 3D printer polycarbonate pulleysOnly the above package content, other products are not included.Note: Light 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.