Durable materials: the piezo pickup is made of high-quality copper and ceramic materials, which are wear-resistant, high temperature resistant, stable, not easy to damage and durable and can be used for a long time without frequent replacement. High quality piezo element: the sound quality of the acoustic pickup converter is clear, thin and light, contactless, noiseless, low voltage, low power consumption. Easy to use: these piezo disc pickups are easy to install, foot tamper and other homemade instruments for sound and vibration detection. Lightweight and portable: these piezoelectric buzzer sets are small, lightweight and very lightweight, convenient for daily use and carry. Wide use: pickup piezo discs, perfect for beginners to use as touch sensors, electronic drum triggers, buzzer, own contact microphones, also for watches, cameras, phones, electronics, computers, etc. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.