Alston Carbon Fiber Bicycle Headset Spacer 1 1/8" Set Stem Set 5-10-15-20mm 4PCS Pack of 5-10-15-20mm high, 3mm Thickness,Use for 1-1/8" (28.6mm) Stem. Ultra Precision Diamond Blade Machine Cut 100% Japan Toray 3k Woven Carbon 100% Japan Toray 3k Woven Carbon Gloss Black finish Designed in USA