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 bikefront 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 effect2.Please allow 1-3cm deviation due to manual measurementDescription:Material: 3 K carbon fiberSize: inner diameter 28.6mm, wall thickness 3mmSpecifications: 3/5/10/15/20mmApplicable: Front fork upper end outer diameter 28.6mm