ICAN Carbon Fiber Bicycle Headset Spacers 1-1/8" Set Stem Set 3/5/10/15/20 5pcs Full Carbon ligthweight headset spacers It is 3-5- 10-15-20mm high. It is perfect to get a good fit on your bike Fixed Bolt Seat Clamp for Better Seatpost Security, Theft Prevention If you need to raise your handle bar, use these spacers.