This is the ORIGINAL design which has been imitated. Slimmer than the Acro Knife and light in weight. If you like the Knife series, but with a lighter feel, then these scissors are for you. The slim version is as powerful as the knife and comes in two variations; one that is a mat finish and one that is semi-mirror which is a glossy finish. Acro Knife resembles an actual knife due the unique design of the blade. The tenacious blades are for slide, wet, or dry cutting. The handle is designed to be “spoon-shaped” for ergonomic hold and feel. Cobalt, Molybdenum. The design is currently registered and pending.