1. This is an upgraded pulley made of solid nylon. More robust2. Universal bearing pulley is suitable for fitness equipment, fitness equipment, weight training machine, garage door pulley system, cable machine and other spare parts3. Light weight, wear resistance, long service life4. Silent pulley, no friction spark, high safety performance, easy installation5. Outer diameter: 90mm; bore inner diameter: 10mm, bearing thickness: 25mm, suitable for ropes up to 7 mm in diameter.colour: blackMaterial: nylon + metalPackage Contents:8 x pulleysOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.