Fotag 180PCS 10-22 AWG Kit Insulated Heat Shrink Wire Crimp Butt Terminal Connectors Electrical Wire Waterproof Marine Automotive Grade Set Connector Assortment (80 Red 60 Blue 40Yellow) DURABILITY - The barrel is created from one seamless piece of copper that eliminates the problem of the barrel opening. Translucent heat shrink tubing provides high tensile strength as well as resistance to stretch and mechanical damage WATERPROOF - Insulation tubing has unique dual-walled design: polyolefin tubing on the outside and hot melt adhesive inside. When heat is applied, polyolefin tubing reduces in size and adhesive flows inside the insulation. Dual walled tubing ensures waterproof seal and prevents wire corrosion EXCELLENT WIRE CONTACT - copper barrel provides increased current flow, and ensures less voltage drop, preventing wiring failures and reducing equipment downtime. Thick barrel ensures strong crimp every time - your wire will never slip out of the connector WIDELY USED - These work great for automotive, marine, and many other applications. Package includes: Red connector 22-18 AWG (80Pcs) Blue connector: 16-14 AWG (60Pcs) Yellow connector: 12-10 AWG (40Pcs)