The for Brompton folding bike easywheel is made of Aluminum Alloy and plastic. The body is made of aluminum alloy. It is super light. High cost performance.Easy wheel hole size is 6mmThe use of high-quality flat rubber ring, the contact surface with the ground is larger, the implementation is more stableThe rubber ring and the wheel frame are barbed to prevent the rubber ring from falling off.The easy turning point is large-caliber Palin, which has much higher durability than small Palin.Colour:silverMaterial:Aluminum alloy + plasticSize:6.2 x 1.5cm Axle hole size: 6mmPackage Contents:2 * folding bike easy wheel2 * screwsOnly 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.