Raogoodcx 100pcs 4 Sizes Waterproof Solder Sleeve Heat Shrink Tube Terminal Connectors with Box Included : 100pcs (Four Sizes:40xRed+30xBlue+20xWhite+10xYellow) heat shrink connectors Can be ideal 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