Product Description Material: POM Quantity: 10 pieces Package Contents: 10*Pulley 1.Material: Durable POM wheels, full metal 625zz bearings. 2.Specifications: Bore: 0.19"/5mm, Outer Diameter: 0.94"/24mm, Height: 0.43"/11mm, Net Weight: 14g/pc 3. Advantages: This plastic pulley has low noise, smooth and stable movement, solves the problem of swing, and improves printing quality and speed. 4.Application: V-groove wheel for V-type guide wheel. Suitable for 3D printers Creality Ender 3 CR-10, CR-10S, Tevo tarantula, laser engraver, CNC milling machine hybrid, 8020 3030, etc. 5.Features: Each plastic pulley has a precision center spacer between the two bearings. If the spacer is absent or too thin, the bearing will be damaged when pressure is applied during wheel installation.