Durable and smooth: The high-pressure POM ring adopts German technology, which is stronger than the compatible withmed pulley. In addition, each bearing has been well painted and tested during the installation process, and has excellent percompatible withmance in terms of sports percompatible withmance.Smooth movement: high printing accuracy and low noise, which can greatly increase the printing speed.Exquisite technology: the casing is made of high quality and high wear resistance POM Polycarbonate, calcined by CNC precision technology, no degumming, smooth surface, no burr, no bubble.High quality bearing: embedded with high quality bearing steel rolling bearing, low resistance, smooth running, higher pressure accuracy and less noise.Specification: bore diameter: 0.19in/5mm, outer diameter: 0.94in/24mm, height: 0.43in/11mm, net weight: 14g/pcsColour: BlackMaterial: metal + plasticPackage Contents:13 x plastic POM pulleynote:1. Please note that there is a removable copper ring between the bearings. If the ring moves, it is normal, otherwise the bearing cannot be adjusted.2. The pulley is processed and produced by a high-precision automatic lathe, and the processing error is within 0.5 mm.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.