Feature:1. DISC SPECIFICATION: The piezoelectric pickup disc has a diameter of 27mm and a thickness of 0.4mm, with about 48cm wire, which is lightweight, thin, and durable.2. GOOD PERFORMANCE: The resonant frequency is 4.60.5KHz, the maximum resonant impedance is 300, this piezo disk has low power consumption and high sensitivity.3. APPLICABLE RANGE: These pre wired piezoelectric discs have compact size, suitable for cigar boxes, guitars, pedals, as well as various string and percussion instruments.4. BRASS MATERIAL: These piezoelectric pickup discs are made of excellent brass material, with good stability, high temperature resistance, and has a long service life.5. MULTIPLE USAGES: Including 12 piezo discs, suitable for beginners to use in touch sensor, electronic drum trigger, buzzer, for making contact microphone, watch, electronic toy, etc.Specification:Item Type: 27mm Piezo DiscsProduct Material: Brass, Electronic WireApplication: Suitable for acoustic guitar pickup, cigar box guitar, drum trigger, etc.Disc Diameter: Approx. 27mm / 1.1inDisc Thickness: 0.4mmWire Length: Approx. 48cm / 18.9in.Package List:12 x Piezo Discs