Brand new 24ct 3D Printer Wheel,Black POM Polycarbonate Roller 625zz, wear-Resistant/Silent/Burr-Free for Creality CR10, Ender 3, Anet A8, Artillery X1 Upgrade Accessories. 625zz POM Pulley 24mm x 10mm Please be aware there's a movable copper ring between bearings. It's normal if the ring moves, otherwise bearing can't rorate. High pressure POM circle made with German tech, stronger than molding pulley. Every bearing is well oiled & tested during installation. Suitable for all DIY 3D printers like Creality, Anycubic, Anet series 3D printer.