Features: Easy one-step connection of wires, soldered, insulated and sealed. Ideal for marine and automotive use. Polyolefin tube outside and hot melt adhesive inside. Soldering and sealing with improved waterproof function. Polyolefin heat shrink butt connectors with improved tensile strength. Provides sealing, strain relief, cable inspection and insulation. Specifications: Material: Plastic Color: Red, Blue, Yellow, White Quantity: 50pcs/bag Including: 50pcs heat shrink butt connectors (20pcs red, 15pcs blue, 5pcs yellow, 10pcs white)