Inside the EMG 35TW are two independent tonal options: a single coil and a humbucker with EMG's renowned preamp circut. The single-coil mode is our JCS pickup built with ceramic magnets and steel pole pieces for a rich, warm tone. The humbucker mode is our popular CS (ceramic steel) dual-coil for a big, aggressive sound with a pronounced mid-range. A push/pull volume (or tone) pot allows you to change from the rich clarity of a J pickup sound to the fatness of the CS humbucker. This four string bass pickup uses a 35 Extended housing that is 3.5 inches (89mm).