Fillers inside the cable assembly can be easily overlooked for their supposed simplicity. Even by name, “filler” doesn’t conjure up an indispensable component of the overall assembly. However, fillers do, in fact, provide several critical support functions to the cable assembly. Most designs of a custom cable assembly require using wires with differing diameters. Fillers help maintain the round shape of the cable which produces both a uniform appearance and provides support. Filler tapes also help maintain the shape and prevent tangling. As well, they help expel any trapped air pockets in the wires. Different applications will require advanced levels of strength, flexibility, and durability which fillers like aramid fiber and steel can provide. Fillers also help reduce the amount of friction between the cables which, in turn, extends the life of the cable. Far from being just “filler”, the materials that help fill the gaps in a cable assembly play an integral role in the form, function, and longevity of almost every cable assembly manufactured.