... and black, engraving fonts 3,ROHS products Product name MP4 computer headset aluminum shell Materials Available1. Stainless Steel: SS201, SS303, SS304 ... :C36000 ( C26800), C37700 ( HPb59), C38500( HPb58), C27200(CuZn37), C28000(CuZn40)4. Bronze: C51000, C52100, C54400, etc5. Iron: 1213, 12L14,12156. Aluminum ...