Features: brand new and high quality Material: The main body of the bicycle V-brake extension for seat is aluminum alloy, which is light in weight and high in strength. The main body is made of aluminum alloy, which is light in weight and high in strength. Durability: The material of the aluminum alloy V-brake converter makes it have higher oxidation resistance, corrosion resistance and rust resistance. Convenience: Mountain bike wheel V-shaped brake extension is easy to remove and insert. Smooth: The right-angle edge of the conversion for seat converter adapter has no burrs, and the edge is soft and smooth, which will not hurt your hands. Rust resistance: The material of aluminum alloy V brake converter allows it to have higher oxidation resistance, corrosion resistance and rust resistance. Specifications: Material:Aluminum Alloy Size:Approx.6cm/2.36inches Color:Black/Gold/Red/Silver Suitable for all for Dahon, Fnhon, birdy bike, OYAMA steel frame, aluminum frame. 14 inch to 16 inch, 16 inch to 18 inch, 18 inch to 20 inch, 20 inch to 451 wheel group "universal type" Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set Extension for Seat