Aluminum alloy material with full CNC machining process treatment, high strength, sturdy and durable to use Hollow design makes it lighter than other which won't add your bike burden Compatible with for 28.6mm (1 1/8 '') front stem fork of MTB mountain bike, road bike, fixed gear, folding bicycle etc. Replace the ordinary monotonous washers to decor your bikes 10mm high to adjust the height of handlebars to fit your riding style Specification: Material: Aluminum Alloy Diameter: 28.6 mm / 1-1/8 inch Height: Approx. 10 mm / 0.39 inch Color: Black / Red / Blue / Green / Gold/ Silver/ Titanium Colors (Optional) Package Includes: 1 Piece Bicycle Headset Washer Note: Due to the differences between different monitors, the picture may not reflect the actual color. There is 2-3% difference according to manual measurement, please check the size carefully before you buy the item. Thanks! Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.