Pixnor Butt Connectors,Heat Shrink,15-24 AWG Crimp And Seal,25-Pack(Pink) 25 pieces of the heat shrink butt wire crimp connectors in one set will be sold together. Color: mainly pink. Material: durable copper, PVC and tinplate. Suits cablewire size: 0.5-1.5mm. Standard crimp and then seal heat shrink butt connectors. Dual-walled design, polyolefin tubing in outside and hot melt adhesive in inside. Allows visual inspection, prevents corrosion, and provided a waterproof seal.