1) Copper ground bar 2) Tin plating 3) All sizes available 1/4"X2"X10", 10 pairs lugs1/4"X2"X12", 13 pairs lugs1/4"X2"X20", 46 pairs lugs...Our ground bars are made of T2 copper, with tin plating for protection, insulators and mounting brackets all included. We can design and produce at customer requests.