The BBB BHP-36 Lightspace Headset Spacers allow you to add the finishing touches to your bike and save weight too. Their unique design means that they save up to 38% on weight compared to ordinary aluminium spacers.Ultra-lightweight aluminium spacersUnique design saves up to 38% on weight compared to ordinary aluminium spacersSet of 4 spacers: 5, 10, 15, 20 mmDiameter: 1.1/8 Set weight: 20g