About This Heat Shrink Solder Seal Wire Connectors Kit: Includes 400pcs*7sizes solder seal connectors + 132pcs*7sizes black 3:1 heat shrink tubes+1pcs heat gun(include detailed instructions) Easy to Use: No soldering or crimping required. Simply strip the wire, insert it into the solder sleeve connector, and heat with a heat gun. The low-temperature solder and hot-melt adhesive create a secure, waterproof splice in seconds Waterproof & Insulated: Dual-wall design combines heat shrink tubing and hot-melt adhesive to form a seamless, airtight seal. This ensures superior waterproofing and long-lasting insulation, even in harsh environments Wide Applications: Ideal for corrosion-resistant and waterproof electrical projects in motorcycles, automotive systems, marine equipment, and outdoor installations. Engineered to withstand vibration, moisture, and extreme temperatures Outstanding features: including terminal and heat shrinkable sleeve, and a hot air gun. The complete suite is suitable for all kinds of scenarios. High-quality hand-held boxes are easy to store and can be reused Overview Color : Yellow Connector Type : Sleeve Contact Material : Copper Insulation Material : Polyolefin Terminal : Butt Terminal