Specifications Name: Solder ring heat shrink tubing Material: Nylon tube Color: Black/Red/Blue/Yellow Type: Heat shrinkable waterproof and pressure-free Operating temperature :-55°C to 125°C Shrinkage temperature :160°C Description Easy to Use: Wire connectors can be connected with just a heat, no crimping tool or soldering machine is needed Waterproof and Insulating: Heat shrink tubing with low heat solder and hot melt adhesive can produce a perfect seal, which helps to be better waterproof Wide Applications: Heat shrink butt connectors are ideal for marine, automotive, trailer and other outdoor applications High Quality Solder Seal Rings: To avoid melting shrink tubing before welding, the recommended heat temperature: 842℉/450℃ Package 50/100/200PPCS Solder ring heat shrink tubing