Item Type: Piezo Discs Material: Brass Product Size: Diameter Approx. 20mm/0.8in, Wire Length Approx. 250mm/9.8in Package List 15 x Piezo Discs All data are measured manually, and there are certain errors in the measurement results. 1SOUND CAPTURE: With high sensitivity and a wide frequency response range, piezo discs accurately capture and amplify the sound of musical instruments with clarity and brightness. 2RELIABLE PERFORMANCE: Piezo disc transducers are manufactured with premium materials for durability and stability, guaranteeing long lasting reliable performance. 3VERSATILE USE: Piezo amplifiers discs are suitable for a wide range of stringed instruments, such as guitars, fiddles and ukuleles, as well as for amplifying other sound sources, such as sound analyzers. 4EASY INSTALLATION: Piezo pickup discs are designed in the shape of a clip that can be easily clipped onto the sound holes of the instrument, making installation quick and easy without causing any damage to the instrument. 5LOW NOISE: Acoustic pickup piezo discs have a noise reduction function that effectively reduces sound interference from the surrounding environment, allowing you to get a clean, noise free sound signal.