Description: This synchronous aluminum belt pulley is designed for 3D printer. It is an 3D printer accessory for 10mm wide belt. As an synchronous pulley wheel, you will find it perfect for 3D printer or similar projects. Features: Adopt high quality aluminum alloy, excellently machined, finished smoothly. This pulley is for 10mm width 2GT timing belt. Comes total 5pcs belt pulleys in one bag which you may use a long time. Perfect choice for building a 3D printer or similar projects. Also good replacement parts for old or broken 3D printer belt pulley. Specifications: Material: Aluminum Alloy Type: Smooth without teeth Height: 13mm / 0.511" Outer Diameter: 18mm / 0.708" Inner Diameter: 5mm / 0.196" Belt Width: 10mm / 0.393" Quantity: 5 Weight: 24g(approx.) Package Includes: 5 x Belt Pulleys Note: 1. Please allow 1-2mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.3. New-style and old-style are shipped randomly.