Features: High-quality material: Carbon fiber weaving, beautiful appearance, good quality, light weight, high strength, high temperature resistance, good impact resistance, can be used for a long time. Exquisite workmanship: The mountain-bike handlebar stem gasket is exquisitely made and made of high-quality materials, which can bring you a good use experience. Adjustables height: This carbon fiber mountain bike stem washer is equipped with 5 specifications of washers, with 3/5/10/15/20mm, so you can adjust the height of the riser through the washers. EASY INSTALLATION: Just connect up the original front bike fork stem, use this bike front fork extension spacer for more maneuverability and lighter weight. WIDELY APPLICABLE: This seats tube spacer is suitable for most bikes with 28.6mm threadless steerer tubes, mountain bikes, road bikes, etc. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Material: 3 K carbon fiber Size: inner diameter 28.6mm, wall thickness 3mm Specifications: 3/5/10/15/20mm Applicable: Front fork upper end outer diameter 28.6mm Package List: 5pcs x Bike Handlebar Riser Washer