Cycearth Bike 3K Carbon Fiber Headset Spacer Kit Fits 1-1/8 Inch 28.6Mm Stems Material: 3K Carbon fiber bike top cap and headset spacers Steel bicycle fork headset star nut TC4 titanium alloy bolt Specifications: Compatibility: fits 1-1/8 inch road and mountain bike stems and forks Spacers weight:28.47g( 3mm:1.62g; 5mm:2.65g; 10mm:5.45g; 15mm:7.75g; 20mm:11g) Headset cap+bolt weight: 5.77g Star nut weight:10.94g Package contents: 1 x Headset top caps 5 x Headset Spacer(1 x 3 mm,1 x 5 mm,1 x 10 mm,1 x 15 mm,1 x 20 mm) 1 x Bicycle fork headset star nut 1 x Bolts( M6 x 30 mm) Compatibility: fits 1-1/8 inch /28.6mm road and mountain bike stems and forks, please check the size of your tube before purchasing. Material:3K Carbon fiber headset cap and spacers;Steel star nut;TC4 titanium alloy bolt. Multi-size spacers: this package contains 5 different sizes,small size of spacer headset let you have a more precise height adjustment. 3K Carbon Fiber Super Lightweight, Durable, Rustproof, Waterproof, automatic cutting, smooth edge, fit most of the road/mtb bicycles.