1 Piece DC power supply capacitors filter PCB, for upgrade your audio amplifier. FR-4 Fiber glass PCB (Double Layer). PCB dimension: 100 x 85mm (approximately 4 x 3.35 inch). PCB thickness: 1.6mm. The PCB can house six diameter 30mm electrolytic capacitors(2 pin), or four 35mm to 41mm electrolytic capacitors(2 pin or 4 pin). This item is one piece PCB, does not include other components, if you want to buy module or capacitors, please visit my shop