No idea sorry but if it says Lexan then that's the same as polycarbonate and vice a versa. I've never handled one of those shells but my guess would be that they're just 4-5mm thick polycarbonate shells.So are the Proline Brute bodies and the Russian indestructible ones, all made from the same material?
Some of the speed run guys I know just buy normal shells and then fiberglass the inside to make them stronger and more rigid.