Low Temp Self Soldering : with one step, you get a soldered, sealed, and insulated connection. | Shrink Tube is Thicker: Excellent stretch and mechanical damage resistance. Quality and durability is outstanding! | Waterproof : Low heat solder and hot melt adhesive can produce perfect seal, protect electrical connections. | Easy to Use: Simply position the stripped wires into the solder sleeve and apply heat to finish the connection. Makes butt connections a breeze. Electrical work gets cut in half! | Compliant with All Relevant Standards: Compliant with ROHS, ISO 9001:2008, SGS and CE standards.