Product Features Easy to Use: No Crimping required. Transparent sleeve provides precise inspection when inserting wires inside. Simply position the stripped wires into the solder sleeve and apply heat to finish the connection. Waterproof: Unique Dual-walled Design, polyolefin tubing outside and hot melt adhesive inside. When heat is applied, polyolefin tubing reduces in size and adhesive flows inside the insulation, creating waterproof seal and preventing wire corrosion. Easy Identification: Color-coded tubing makes it easy to identify the right size of the connector for every application. Ideal used for Motorcycle, Automotive, Marine and other Home Applications. IP67 Waterproof: The design that Polyolefin Tubing outside and Hot Melt Adhesive inside creates a durable waterproof seal between the wire and the connector. Waterproof feature makes it perfect to prevent any corrosion even in the most humid environments. How To Use HOW TO USE HEAT SHRINK CRIMP BUTT CONNECTORS? Strip and Insert ?U Select the terminal with right wire gauge for the wires; ? Strip 2 wires to about 8mm; ?U Twist and insert into splice barrel in the middle. Crimp ?U Crimp the middle side of the terminal; ? Crimping tool with gauge dots is better choice for this project. Apply Heat ?U Rotate the terminal while applying heat until it reduces in size and the adhesive flows, filling gaps within the connector; ? For better results, you?Zd better use a heat gun. Seal & Done. ?U Inspect your waterproof quality connection. ? Allow the terminal to cool down for use. HOW TO USE SOLDER SEAL WIRE CONNECTORS? 1.Strip and Insert ?U Strip wire insulation 1/3 inch on both wire ends. ? Slip the connector into one of the wires. ?U Twist the strands together. 2.Apply Heat ?U Apply heat while continuously rotating the wire to make the connector evenly heated. ? For better results, you?Zd better use a heat gun. Note Size: 10 X Yellow connector: Suits cable/ wire sizes 0