This highly polished Piston Desk Clock is crafted out of a piston from a formerly active Cessna 402 airplane. The piston has been machined at a 70-degree angle for viewing clear view, and hand-buffed to a mirror-like luster. It measures 4" in diameter and 2 _" in height. The clock face is 3" in diameter. This desk clock features a modern industrial look. The 25-piece limited edition features hand-engraved numbering at the back of the piston. The clock is powered by an AAA battery.