This post contains affiliate links. As an Amazon Associate I earn from qualifying purchases Specifications: Type: Carbon Spacers Material: Full carbon Weave:3K Weight:15g(4pcs) Available sizes:5mm-10mm-15mm-20mm Package including: 4pcs headset spacer Product Features Pack of 5-10-15-20mm high, 3mm Thickness,Use for 1-1/8″ (28.6mm) Stem. Lightweight Full Carbon Fiber T700 Fixed Bolt Seat Clamp for Better Seatpost Security, Theft Prevention Gloss Black