Heavy-duty Piezo ignition for increased durability. Solder sleeve wire splices – Shrinkage ratio 2:1, Waterproof for wiring splices, Transparent sleeve for easy inspection, Easy control soldering process. Heat shrinkable crimp splices – Shrinkable Ratio 3:1, Polyamide hot-melt adhesive provides excellent water resistance, Excellent stretch and mechanical damage resistance, High elasticity for a durable connection. General purpose, flame retardant polyolefin tubing – Shrinkage Ratio 2:1, Resistant to common workshop fluids and solvents. Ideal for multiple applications including soldering, heating and heat shrinking.