FTTH Butterfly Optic Cables, also known as flat drop fiber cables, feature a compact flat profile with optical fibers placed at the center and reinforced by parallel strength members on both sides. The outer sheath is typically LSZH or PVC, optimized for indoor and outdoor environments. A self-supporting drop cable, on the other hand, adds a thick steel wire suspension to the ordinary drop cable structure. It can be used for laying in indoor environments such as vertical shafts. Butterfly-shaped optical fiber cables are a popular type of fiber optic cable that is commonly used for data transmission in telecommunication networks.