iztor 100pcs Waterproof Solder Seal Heat Shrink Butt Terminal Connectors with Soldering Sleeve Included : 100pcs 22-18AWG 0.5-1.5 mm2 heat shrink connectors,An easy one step connection of wires, soldered, insulated and sealed Polyolefin heat shrink butt connectors improved pullout strength, provides seal, strain relief, cable check, and insulation Can be ideal use in marine and automobile applications Polyolefin tubing in outside and hot melt adhesive in inside Material: Tinned Copper