Fan out fiber optic pigtails are multi fiber cable assemblies, usually it is made from a multi fiber count cable, in the middle of the cable we use the splitting kits to make the fan out pigtails, such cable is usually 1XN structure, like MTP to 12 LC, sometimes there are also NXN types, like 12LC to 12LC. Usually the simplex fiber optic pigtails used inside management equipment use 0.9mm outer diameter cable, there is waterproof fiber optic pigtails used for outdoor applications, this fiber optic pigtail is with thick PE jacket and big diameter.