This clock was made from a recycled aluminum bike wheel and tire. 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, and runs on 1 AA battery, included. This wheel and tire measures roughly 26 inches in diameter. Since these clocks are made from actual recycled bike wheels, there will be minor imperfections such as scuffing, scratches, corrosion, warping, etc. 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. Handmade in the USA.