The FPFA-016-6016 AST is a 16-piece black Heat Shrink Tubing Assortment is a flame-retardant flexible polyolefin tubing. It can be used for fire-resistant component coverings and flammable wire assemblies, as well as lightweight harness covering, wire marking and wire bundling. Meets MIL-DTL-23053/5, class 3 requirements.