Ibanez UB804-MOB Upright Bass with Piezo and Note Markers (Mahogany Oil Burst)UB804MOB FEATURES AeroSilk Piezo pickup custom for Upright Whether bowing or finger picking, this specially modified piezo system detects the vibrations of the strings that vibrates in different shapes, and then outputs the signals at equalized level. Padded Gigbag A padded gig bag can carry everything in it, including the bass itself, bow and stand. SPECIFICATIONS AeroSilk Piezo pickup custom for Upright AeroSilk Piezo system w Active tone control