About this item Materials: Made of carbon fibre and aluminum alloy. Pakage Include:Package includes 11pcs headset spacer in 6 sizes, 3 x 2mm, 2 x 3mm, 2 x 5mm, 2 x 10mm, 1 x 15mm, 1 x 20mm. Unique Design:The unique tapered design of the ultra-lightweight aluminium spacer effectively finishes off the aesthetics of the assembly. Automatic cutting, smooth edge, fit most of the road bicycles, delicate texture and durable to use. Suitable for MTB bike,road bike.