Made from aluminum alloy material, strong, lightweight and durable Seatpost shim will make your seatpost fit into your oversized seat tube It is used to make your seatpost fit into your oversized seat tube. Exquisite processing technology, simple and elegant, bicycle seatpost tube reducer sleeve bring the convenience to your travel Suitable for MTB bike, mountain bike, road bike, etc. Specification: : ENLEE Material: aluminum alloy Weight: 22.2mm to 25.4mm (about 20g), 25.4mm to 27.2mm (about 13g), 25.4mm to 28.6mm (about 23g), 27.2mm to 28.6mm (about 12g), 27.2mm to 30.4mm (about 24g), 27.2mm to 30.8mm (about 26g), 27.2mm to 31.6mm (about 33g), 27.2mm to 33.9mm (about 51g), 31.6mm to 33.9mm (about 20g), 33.9mm to 34.9mm (about 7.9g) Suitable for: 22.2mm, 25.4mm, 27.2mm, 31.6mm, 33.9mm diameter seatpost Package included: 1 x Seat Post Adapter Shim