Front Brake Caliper:60*29*20mm Rear Brake Caliper:107*21.5*13mm Material: Aluminum Alloy Color: Black/Red/Gold Packing List:1 Set C Caliper Extension For Road Folding Bicycle Features: Suitable For Retrofitting SP8 P8 P18 MP18 And Other Vehicles To Retrofit Integrated Road Bending Handle In The Case That The Frame Itself Has Mounting Holes, This Conversion Seat Can Be Used To Modify The C Brake. Note: Please allow 1-3mm error due to manual measurement.pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item.