This 6:1 ratio heat shrink tubing is ideal for creating weatherproof seals for large cable bundles. This tubing conforms to UL94V-0 Standards for flammability and is Military specified for adhesive lined heat shrink tubing under, MIL-DTL-23053/15, Class 1. This tubing shrinks down to 1/6th of its size to accommodate large cable assemblies and adapters.