Packing List: 24pcs 625zz POM Pulley
Notification: Please be aware there' s a movable copper ring between bearings. It' s normal if the ring moves, otherwise bearing can' t rorate. It' s not quality issue.
Durable&Smooth: High pressure POM circle made with German tech, stronger than molding pulley. Besides, every bearing is well oiled and tested during installation, work excellent in movement.
Compatibility: Suitable for all DIY 3D printers like Creality, Anycubic, Anet series 3D printer.
Switch your 3D printer wheels after 6-9 months use will extend your 3D printer life.