1. Aluminum alloy material, strong and durable, not easy to rust 2. Simple installation, convenient and practical 3. Use: seat tube reducing sleeve (large to small) 4. Material: aluminum alloy 5. Specifications: 27.2mm to 25.4mm, 28.6mm to 25.4mm, 28.6mm to 27.2mm, 30.4mm to 27.2mm, 30.8mm to 27.2mm, 31.6mm to 27.2mm, 33.9mm to 27.2mm, 33.9mm to 31.6 mm 6. Size: about 6cm/piece 7. Weight: 27.2mm to 25.4mm about 11g/pc, 28.6mm to 25.4mm about 20.5g/pc, 30.4mm to 27.2mm about 22g/pc, 30.8mm to 27.2mm about 25g/pc, 31.6mm to 27.2mm about 31g/piece, 33.9mm to 27.2mm about 49g/piece, 33.9mm to 31.6mm about 69g/piece
