This is 48mm 1-Meter PVC Heat Shrink Sleeve Blue for Lithium Cell Pack. PVC Heat Shrinks are mainly used to protect, insulate and hold all your battery packs in place. You can use a hair drier or a heat gun to shrink the tube properly.
It provides electrical insulation, mechanical protection, sealing, and strain relief, and it can also be used to identify components and wires, creating a functional, professional appearance of the assembly.
(Note: Product Image are shown for illustrative purposes only and may different from the actual product)