Matl beryllium copper cond 1/2 hm alloy 0.0100 in. Thk; finish silver plate 0.0002 min. Thk grade a per qq-s-365; temp range m65 to p125c; knoop hardness number 240 min. Using knoop indenter with 500 gram load; has 20 cavities; dimensions 0.753 in. By 0.426 in. By 0.776 in.