This is a small bicycle clock made out of recycled bicycle sprockets. SIZE: close to 5.2'' (12.5cm) in diameter MATERIALS: Solid metal bicycle parts, gears, sprockets MECHANISM: Non-ticking, silent quartz clock mechanism. Runs on 1 AA type battery COLOR: Silver/ black VARIATIONS: Wall hanging or desk type We can offer a custom engraving of your choice on a small, brushed metal plate affixed to the back of the clock. It will make a great gift for any bicycle lover or someone who already has everything. It also looks great & will make a great conversation starter in your home or work place. & of course, it tells time! :) Check out my other clocks: clocklight.etsy.com All clocks are made from previously used parts. They are thoroughly cleaned but might show some signs of previous usage. in my opinion this adds to the item's charm. Unique Industrial Desk Clock Made Out Of Recycled Bicycle Gears, Perfect Gift For Cyclist Boyfriend Or Husband, Garage Office Decor