In order to ensure the top quality of the caster wheels,our chair wheels made from upgraded nylon stand polyurethane, heavy-duty construction makes it strong enough, the bracket designs from solid steel, even load up 650 lbs. And Rubber surface design provides well Cushioning Performance. Absolutely the best chair wheels replacement for you.Perfect Compatibility & Safe: These office chair caster wheels come with a high-quality soft polyurethane layer, to avoid leaving marks on any surface, perfect for all floors. Even not need to floor mat or carpet.High Stability & Quiet Rolling: Adopt roller skates technology and passed the many strict tests, our chair wheels design with precision ball bearings combined with vibration-reducing rubber makes rolling smooth and silent roll, widely use for hardwood floors/ carpet/ mat.Easy To Install: No required tools for replacing, just put out the old wheels from the chair base and push the chair wheel's support bracket into the base, very easy to finish the work within several minutes. Fit most office chairs sold in the USA but Not for IKEA chairs.colour: as shownMaterial: PUSize: 75mmPackage Contents:5 x WheelsOnly the above package content, other products are not included.Note: Light shooting 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.