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)