DescriptionThe 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. Whether you are working on your boat, vehicle, home or scientific project, our Heat Shrink Butt connectors will ensure strong crimps, increased current flow and waterproof connections every time! Start making durable, secure and waterproof connections today.Features- Color: Shown in the pictures. - Material: Tinned copper. - Size: Approx. 8 * 1 * 1cm/ 3.1 * 0.4 * 0.4 inch (LWH). - An easy one step connection of wires, soldered, insulated and sealed. - Can be use in marine and automobile applications. - Polyolefin tubing in outside and hot melt adhesive in inside. - Solder and seal and with advanced waterproof function. - Polyolefin heat shrink butt connectors improved pullout strength, provides seal, strain relief, cable check, and insulation.