The item is a set of 25pcs simple and practical butt wire crimp connectors terminals 1.5-2.5mm, which are mainly made of copper, PVC and tinplate materials, and features dual-walled design with polyolefin tubing in outside and hot melt adhesive in inside. They allows visual inspection, , and a waterproof seal. Features - Color: Yellow. - Material: Copper & PVC & Tinplate. - Suits cable/wire size: 1.5-2.5mm. - 25 pieces of the heat shrink butt wire crimp connectors in one set will be together. - Standard crimp and then seal heat shrink butt connectors. - to hold the strong crimps. - Dual-walled design, polyolefin tubing in outside and hot melt adhesive in inside. - Allows visual inspection, prevents corrosion, and provided a waterproof seal. - For best results use a hot air until it reduces in size and the adhesive flows, filling gaps within the terminal. Package list: 25 x Heat Shrink Insulated Butt Wire Crimp Connectors