The DIMOTIV Front Sprocket Cover is made from 6061-T6 aluminum alloy and anodized surface which is same level as iPhone equivalent standard; include anti-corrosion and anti-UV for 60 hours endurance under 100 eV UV exposure. The hollow-carve design not only provide a marvelous visual experience of operating chain but enable you for handy maintenance to extend life-span of chain. Not to mention the extraordinary out looking of the anodized surface with gold, titanium and black to fit for your favourite