1.* Thickened Copper Terminals: Our ring terminals are made of copper to ensure maximum conductivity. The thickened construction enhances durability under temperatures, and the tight end cushion design securely protects electrical components and cables from moisture. 2.* Heat Shrink Tubing: The 3:1 dualwall heat shrink tubing in this set is made of material (polyethylene hot melt adhesive). It is thick and provides protection for your connections. 3.* Wide Range of Sizes: With 160 pieces of various types of ring terminals and 80 pieces of heat shrink tubing, this set meets your diverse needs. The ring terminals are available in sizes for AWG 2, 4, 6, 8, and 10/12, suitable for various applications. 4.* Reliable and Easy to Use: Our battery terminals feature a sturdy construction and a closedend cushion, ensuring reliable performance and easy installation. The precut heat shrink tubing saves time and effort, improving work efficiency. The inspection window design allows for visual verification of proper wire insertion.