Unique idea and nifty engineering! Superb smooth finish in your choice of colour literally in your face! Get rid of the ugly black plastic stock originals. We offer a wide range of reservoir caps to fit Front Brake, Clutch and Rear Brake Cylinders on a huge range of models. Comes complete with countersunk bolts where necessary. Measurements are the outside diameter. Use your original membrane. Material - High Tensile Anodised Aluminium.