Features: The pulley has a lower coefficient of friction, reduced vibrations, and lower noise. Our waterproof bearing pulley is suitable for fitness equipment and garage door roller disc systems. The pulley is made of quality wear-resistant PA material and can be used for many years. It is a universal pulley for most fitness equipment, ideal for replacing rollers on fitness machines. Specifications: Material: PA Color: As shown in the picture Size Options: 50/60/70/90/100/110/120/160 (More size details available in the photo.) Package Includes: 1 Piece Bearing Pulley Note: Please allow 1-2 cm error due to manual measurement. Ensure you are comfortable with this before purchasing. Due to differences in monitor displays, the picture may not reflect the actual color of the item. Thank you!