This kit replaces the bolts around the petrol filler cap you can choose your colour to match or contrast your paintwork or just go subtle to blend into the surround. The choice is yours. Material High Tensile Anodised Aluminium. They are available in Black, Blue, Gold, Orange Purple, Red and Silver, so you can really make your bike stand out. Kits are easy to use, remove one bolt at a time, and replace with an identical length Pro-Bolt in to your original backing clip.