This clock was created from a recycled, aluminum bike wheel. The wheel mounts directly to the wall through the hub using a hollow wall anchor and gives the illusion that it is floating off the wall. The clock movement is a high torque quartz movement and is attached to a set of rear cassette gears to conceal the movement. The clock runs on 1 AA battery, included. This wheel measures roughly 25 inches in diameter. Since these clocks are made from actual recycled bike wheels there will be imperfections with signs of use and age, to include, scuffing, scratches, warping, oxidation, etc. The bike wheel is thoroughly cleaned and ready for display. Handmade in the USA. It will make a great conversation piece on your wall or a special gift for that bike nut you know who is so hard to shop for. Thanks for looking.