SPECIFICATION: Heat shrink wire connectors are made of tinned red copper: Excellent conductivity and corrosion resistant Dual-walled design: Polyolefin tubing outside & Hot melt adhesive inside Premium polyolefin heat shrink tube shrinkage ratio 3: 1 Minimum shrink temperature: 175°F (80°C) Full recovery temperature: 265°F (130°C) Operating temperature: -65°F–255°F (55°C – 125°C) HOW TO USE? 1.Strip wire insulation and insert the strand copper in to the splice barrel. 2.Crimp the barrel with professional crimper. 3.Use hot air gun to heat it. Heat the connector evenly by rotating it during heating. 4.Done! It’s done after heating and cooling PACKAGE INCLUDINGS: 1. 53 x White Heat Shrink Wire Connectors (A.W.G.:26-22) 2. 150 x Red Heat Shrink Wire Connectors(A.W.G.:22-18) 3. 100 x Blue Heat Shrink Wire Connectors (A.W.G.:16-14) 4. 32 x Yellow Heat Shrink Wire Connectors(A.W.G.:12-10) NOTE: For best results, please choose the right connector, use a hot air gun, heat evenly until connector reduces in size and the adhesive flows, filling gaps within the terminals. While cool down, there should be adhesive on the edge, but make sure there are no bubbles. Make sure this fits by entering your model number. RECOGNIZABLE: Includes 4 sizes, 335PCS in total, 53PCS White (A.W.G.26-22), 150PCS Red (A.W.G.22-18), 100PCS Blue (A.W.G.16-14), 32PCS Yellow (A.W.G.12-10), which comes within a storage box. Tubings of varying colors with easily recognizable wire gauge markings. Simply measure the wiring, and by checking the mark of wire gauge of the polyolefin tubing, then you can quickly choose the right connector. HIGH-QUALITY RED COPPER CORE: Heat shrink butt connectors use a copper core with a higher thickness rating. which is easier to flatten and grasp the wires, to enhance electrical conductivity. WATERPROOF: Insulation tubing has unique dual-walled design. High quality 3:1 shrinkage tubing has a heat-activated sealant lining to provide a 360-degree secure seal. Lined with a polyolefin adhesive glue so that when crimped onto the wire ends and heated the terminal is completely sealed against air, water, moisture. They are resistant to corrosion and chemical erosion. WIDE APPLICATIONS: Perfect for marine and automobile applications, whether you are working on your boat, Vehicle, Home or scientific project, our electrical crimp connector will ensure strong watertight seal to make sure everything bond correctly. QUALITY COMMITMENT: We stand behind the quality of our products. If for any reason you are not satisfied with your purchase, please contact us. We offer a 30-day money-back guarantee, and a 12-month replacement warranty giving customers a 100% Satisfaction Guarantee for risk-free purchases!