This is the “ORIGINAL” design which has been imitated. These scissors are slimmer then Acro Knife and very light 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 version 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 a knife due the unique design of the blade. The tenacious blades are great 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.