Winicebikes Carbon Fiber Bicycle Headset Spacers 1-1/8" Set Stem Set 5-10-15-20mm 4 pcs Made of 100% carbon fiber, with 3k weave and glossy finish Precision machine cut, stack nice together 1-1/8", 4pc as a group for MTB/road/race bikes Height: 5/10/15/20mm ; Width: 3mm Great partners, easy peasy to use them to raise your handlebar