Originally designed as a disposable surgical knife for medics, paramedics, and aid workers, the Cardsharp is an innovative, super-light folder that's the size of a credit card and not much thicker. And maybe the first perfect "shirt pocket" knife ever! At first glance, it appears the knife slides out of the card, but the durable polypropylene card is actually the handle. You fold the blade out, then fold the corners of the card inward and snap them together to make a three-layer handle. Reverse the process to put it back in your pocket. The thin, surgical sharp blade cuts through tennis balls and tomatoes. Weighs a barely noticeable 1.6 oz. Measures 3-1/8" x 2-1/8". The stainless steel blade has 2-3/4" cutting edge.