Easyou Carbon Fiber Bicycle Headset Spacer Pack of 5 Fits 1-1/8" (28.8mm) heads, steerer tubes. 3 mm, 5 mm,10 mm,15 mm, 20 mm spacer*1pcs each. 100% Pure Carbon Fiber, Super light weight headset spacers Diameter: 28.8mm ( 1 1/8"), Net Weight: 30g (5 Pieces)