Use for 1-1/8″ (28.6mm) Front Stem Fork. Material :Quality Aluminum Alloy,Great Anti-corrosion and Lightweight, Only about 35g (7PCS) Comes Anodized in Black,Colorfast Surface,Ultra Precision Diamond Blade Machine Cut, Fit All Road /Mountain Bikes Multi-size for You to Adjust The Appropriate Height,Small Size of Spacer Headset Let You Have a More Precise Height Adjustment. Package Included: 1*2mm, 1*3mm, 1*5mm, 4*10mm (7Pcs)