This is the “ORIGINAL” design which has been imitated. Acro Knife series comes in two variations; one is a mat finish and the other is a semi-mirror, which is a glossy finish. Acro Knife resembles an actual 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.