Manufacturer Youmile. 20 x 27mm Piezo Discs Piezo Pickup. Colour 27 mm. Item Weight 30 g. 20 x foam sticker. Static Capacitance: 28000PF +/- 30%. Part number JK-YM-297. 【High Performance】: Resonant frequency 4.6 +/- 0.5 KHz, resonant impedance 300 ohms max, low power consumption and high sensitivity.
