The optical fiber unit, Pre-terminated Drop Cable, is positioned in the center.Two parallel Fiber Reinforced Plastics (FRP) are placed at the two sides.Then,the cable is completed with a black or color LSZH sheath. It is also called leather cable. It is a new type of user access optical cable. According to the application environment and laying conditions, the cable structure and various technical parameters are reasonably designed. The characteristics of indoor soft cable and self-supporting optical cable are collected. Special equipment is used in conjunction with imported precision mold production. It is the best candidate for FTTX network solution, and it is also suitable for users of other fiber-optic FTTO and FTTB networks. Because the cross-section is like a butterfly, it is called a butterfly cable. Both sides are reinforcing members in the leather line and optical fibers in the middle.