InstallGear 1/0 Gauge AWG Tinned Pure Copper Lug Ring Terminals Connectors 10-pack includes: 10 Pure Copper Lugs, 5 Red Heat Shrink Tubes, 5 Black Heat Shrink Tubes. Pure Copper Allows Maximum Conductivity. Heat Shrink Tubing Makes a Secure Seal and Color Coded Heat Shrink to Differentitate Polarity. Ring Size: 3/8". Wire Input Size: 1/2"