Product AdvantageThe pulleys are produced by high-precision automatic lathe machining, with machining error within 0.005mm. ├óÔé¼┬ó Smooth motion, high printing precision, low noise, can greatly improve the printing speed. ├óÔé¼┬ó Perfect For 3D Printers: CR-10, CR-10S, Tevo Tarantula, CNC router, 8020 3030 and so on. ├óÔé¼┬ó This pulley bearing adopt of Motor grade bearings, rust resistant, wear resistant, excellent friction resistance and operate smoothly.Product SpecificationMaterial: POM/DelrinColor: Black Outer Diameter: 24mmInner diameter: 5mmHeight: 10.23mmN.W.: 14g/pcsPacking List1* Plastic wheels with bearing