Description Piezo discs are small, thin, and highly sensitive acoustic transducers, which can be used in acoustic instruments such as guitars, violins, and mandolins to amplify the sound. Piezo discs are made of copper, which is durable, does not deform, and can withstand a lasting service life.Easy to install and use, perfect for beginners and professionals alike. Features -Color:As Shown-Material:Copper-Size:2.70X11.50X0.10cm/1.06X4.52X0.04in- Piezo discs have excellent sound effect for acoustic instruments, easy to install and use.- Mainly made of copper material for stability and durability, and enough to meet your needs.- Piezo discs are highly responsive and can pick up even the slightest vibrations, resulting in a clear and accurate sound.- The piezo discs are versatile and can be used in a variety of acoustic instruments, including drums, pianos, and wind instruments.- Piezo discs offer a effective solution for amplifying acoustic instruments, allow for convenient to use.Packing list: 20 x piezo discs