Attributes . Eco-Max Is The First Environmentally Friendly; The Post Top Design is Manufactured With The Highest Quality C11000 ETP (Electrolytic Tough Pitch) Copper and is Completely Lead Free; C11000 ETP Copper Battery Terminals Provide The Highest Conductivity Rating Compared to Any Competing Copper Design; Maximum Electrical Conductivity is 101% Iacs at 68 Degrees F, Typical Designs Fall At 20% And 32% Iacs at 68 Degrees F . Names