Plastic pulley bearing is passive round pulley for 3D printers. This pulley bearing adopted motor grade bearings. The outside of the wheel has good physical, mechanical and chemical properties, especially with excellent friction resistance, workmanship and in use. Feature - ColorTransparent - Material: Plastic. - Size: 3.00X3.00X1.50cm/1.18X1.18X0.59 inch. - These pulley bearings are used for 3D printers. Perfect replacement parts for 3D printers. - The pulleys are produced by high-precision automatic lathe machining, with less machining error. - Fully oiled pulley, smooth and accurate to high move precision, stability and no noise. - This pulley bearing adopt motor grade bearings, rust resistant, wear resistant, excellent friction resistance and operates smoothly. - This pulley is made of plastic material. These pulleys are , sturdy and wearable. Package list: 3 x Pulleys