SSB for Sound Box(Gum Rosin PCB) 1L, FR-1, 1.6mm, 1OZ, Black(top) ... DATA1Layers1-16 Layers2Base-materalFR-2, CEM-1, FR-4, Metal base, Rogers...3Board thickness8~126 mil (0.2~6.0mm)4Copper ... /mm26Thermal Shock3 x 10Sec@288ºC SSB for Sound Box(Gum Rosin PCB)