15 Pieces - 27mm Piezo Disc Elements with 4" Leads - Acoustic Pickup Cigar Box Guitar CBG Great for Acoustic Instrument Pickups, Stomp Boxes, Contact Mics, Etc... Primarily used in acoustic guitars, CBGs, drums, and contact microphones 27mm brass outer diameter plate, 100mm leads Resonant Frequency: 4.6KHz +/- 0.5KHz Capacitance @ 100Hz: 16,000pF