【Delivery Content】Spacers for bicycle headsets 2/3/5/10mm 【Effect】These bike headset spacers for bicycle headsets can help you adjust the height of your handlebars precisely for a more comfortable ride. 【Features】The inner diameter is 28.6 mm and the wall thickness is 3 mm. With 3K carbon fabric, compact and high-strength, fully automatic cutting, the incision is smooth and does not peel off. 【Lightweight spacers】The light weight of the bicycle ahead stem spacer does not put too much strain on you. 【Wide use】This bicycle ahead stem spacer is very suitable for most bicycles, mountain bikes, road bikes, MTB, BMX, fixie gear, etc. Bicycle Ahead Stem Spacer Set