Our classic undersaddle ceramic pickup, AG-Series pickups do not require a battery and can be plugged directly into the amp of your choice. AG-Series pickups’ performance can be greatly enhanced with the use of an impedance-matching preamp such as our Platinum Stage, Platinum Pro EQ or Powerjack. Width 3.2 mm. The AG-125 is suitable for most instruments with string spacings from 52.7 mm to 55.3 mm.