China 4 Inch GaAs Wafer (5PCS pack) Si Doped 350um (100) 15 Degree off Toward 111A Prime Grade, Find details about China GaAs Substrate, Gallium Arsenide Wafer from 4 Inch GaAs Wafer (5PCS pack) Si Doped 350um (100) 15 Degree off Toward 111A Prime Grade