100 PCS Insulated Heat Shrink Butt Connectors Electrical Wire Waterproof Marine Automotive Grade Terminal Set Wire Crimp Connector Assortment Red 22-18 AWG Blue 16-14 AWG Yellow 12-10 AWG DURABLE - seamless copper barrel design provides high tensile strength and extreme stretch and mechanical damage resistance, translucent heat shrink tubing eliminates the issue of the barrel opening, high elasticity keeps steady performance WATERPROOF - dual-walled insulation design provides waterproof seal ideal for marine and automotive applications, designed with polyolefin outside and hot melt inside to prevent any wire corrosion NO SLIP WIRE CONTACT - thick barrel ensures strong secure crimp every time to prevent wire failure, increase current flow, decrease voltage drop, and reduce equipment downtime. When heat is applied, polyolefin tubing reduces in size and the adhesive flows inside the insulation filling gaps within the terminal. EASY USAGE - color-coded tubing allows for quick identification of the right connector, Simply measure and pick the right one WARRANTY - Perfect for all boat, vehicle, home, scientific or commercial projects in need of secure and durable connections. Any issues with our heat shrink butt connectors simply contact us and we will respond within 12 hours