Features:
1. [] Made of brass and ceramic, resistant, stable, and long service .
2. [Size] Piezo pickup plate with thickness in 0.4mm, small, thin and lightweight.
3. [] Resonant frequency 4.6 +/- 0.5 KHz, resonant impedance 300 ohms max, low consumption and high sensitivity.
4. [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 detection.
5. [Wide Usage] Perfect for beginner to use as -sensors, electronic drum triggers, buzzers, make your own mics, also used for watches, cameras, phones, electronic , , etc.

Specifications:
Type: 20mm diameter & 250mm cord length / 27mm diameter & 330mm cord length / 35mm diameter & 250mm cord length (Optional)
Material: Brass
Thickness: 0.4mm thick
Resonant Frequency: 4.6 ± 0.5 KHz
Resonant Impedance: 300Ω max
Package Weight: 50g/70g/70g
Package Size: 15*10*5cm

Package List: I9197-27
15*Piezo Discs