DescriptionThis item is aset ofprofessional piezo discs. Made from premium material, they are durable and practical for long time use. They are lightweight, easy to carry andinstall. Suitable for homeappliance, watches, electronic toys, electronic drum triggers, acoustic transducers, etc.Features- Color:As Shown.- Material: Copper. - Size: About2.50X2.50X0.10cm/0.98X0.98X0.04inch. - Adopted of premium material, it is both durable and practical. - Small, thin and lightweight. Low power consumption and high sensitivity. - Come with a large quantityto meet your need. - Easy to installinhomeappliancefor sound and vibration detection. - Perfect for beginner to use as acoustictransducers, electronic drum triggers, buzzers, also used for watches, electronic toys, computer, etc.