Using high quality Bearings, More Smooth And Quick Response, Circlip Type Design, Do Not Worry About The Bearing Will Rub The Edge And Cause Abnormal Noise, Enlarge And Widen The Tire, Anti-Skid And Good Passing Performance.Application: Suitable For Folding Bike, Screw Mounting Specification M6.size:85x12mmMaterial:Aluminum silicone rubbercolour:GoldPackage Contents:2 * folding bike Easywheel2 * screws2 * Gasket1 * wrenchOnly the above package content, other products are not included.Note: Light reflection 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.