Dimensions and Quantity: This package includes 11Pcs carbon fiber headset spacers, 6 different sizes: 2×1mm, 2×2mm, 2×3mm, 2×5mm, 2×10mm, and 1×15mm. Suitable for different riding heights to accommodate diverse riding experiences. Precision Engineering: This carbon fiber headset spacers Inner diameter 28.6mm, outer diameter 34.9mm. Utilizing ±0.01mm precision micro-adjustment technology, it ensures a perfect fit for your bicycle's head tube, guaranteeing flawless alignment. Material and Performance: High-density woven carbon fiber, it offers superior strength and lighter weight compared to aluminum alloy headset spacers. While also delivering excellent high-temperature resistance and impact resilience. Appearance and Details: The surface of this carbon fiber headset spacers a matte finish. Computer-controlled automatic cutting ensures smooth edges free of burrs, exquisitely detailed. The high corrosion resistance ensures reliable performance in all weather conditions. Wide Application: Compatible with all 1-1/8inch (28.6mm) front stem forks. it fits all modern performance bikes, including MTB, road, cruiser, and electric bikes. Adjust stem height through multiple combinations to customize your riding experience. 11PCS Bike Carbon Fiber Headset Spacers，Lightweight and Precision，Matte Finish，Fits 1-1/8 Inch Stem for MTB，Road Bicycle Handlebar Stems， (15/10/5/3/2/1mm) 6 Sizes