Cold drawn wire fibers: this kind of steel fiber is to use for 0.4 ~ 1.0 mm in diameter in accordance with the relevant regulations of the length of the cut into short fibers. The processing method can use a cutting knife, punch or rotary tools. Cold drawing wire made of steel fiber tensile strength can reach 1000-2000 MPa, but its surface is smooth, concrete or cement mortar substrate bond strength is poor. In order to enhance the steel fiber and aluminum bonding strength, usually we can change the shape of the steel fibers, namely the special-shaped steel-fiber production methods to solve them. The common methods are pressuring edges, bending method, and waveform method. The material classifications have carbon steel and stainless steel fiber.