Outer diameter: approx. 24mm. Bore diameter: 5mm. Thickness: approx. 10.23mm. Net weight: 13.4g/pc. The plastic roller bearing is a passive round V-groove pulley for 3D printers. POM/polyoxymethylene resin. The exterior of the wheel is made of POM material, which has good physical, mechanical, and chemical properties. This type of V-groove is widely used in wheel alignment, cables, and belts. These pulley bearings are equipped with rust-proof ball bearings, resistant to wear and friction, and operate smoothly. Perfect for 3D printers: Creality Ender 3/Ender 3 Pro/CR-7/CR-8/CR-10/CR-10S/CR-10S Pro, Anycubic Chiron, Tevo Tarantula.