SSB for Sound Box(Gum Rosin PCB) 1L, FR-1, 1.6mm, 1OZ, Black( ... , 2oz, 3oz, 4oz, 5oz (18-175um)5working panel size12" x 13" ~ 21" x 24"6Min. drill size(finished)8mil (0.2mm)7Hole ... abrasion≥6H24Electric strength>1.3KV/mm25Peel Strength1.4N/mm26Thermal Shock3 x 10Sec@288ºC SSB for Sound Box(Gum Rosin PCB)