[High Quality] Made of brass and ceramic, temperature resistant, stable, durable and long service life

[Size] Piezo pickup plate diameter 27mm, thickness 0.4mm; wire length 33mm(13"), small, thin and lightweight

[High Performance] Resonant frequency 4.6 +/- 0.5 KHz, resonant impedance 300 ohms max, low power consumption and high sensitivity

[Easy To Use] These pre-wired piezo pickups are easy to install and use in cigar box guitars, foot stompers and other home-made instruments for sound and vibration detection

[Wide Usage] Perfect for beginner to use as touch-sensors, electronic drum triggers, buzzers, make your own contact mics, also used for watches, cameras, phones, electronic toys, computer, etc