Hi. Bought this a month ago and dropped it into my Steinberger XQ25 only to discover the pickup doesn't pick up the B string. It should work fine for a 4-string. I went with this one because the dimensions were right for my bass. That said, I installed single string ABM bridges which widened the string spacing...a bit too much....oops! This is the EMG35 shape (1.5" x 3") or (38mm x 89mm) I have seen drawings that show 2 screw holes on the bass side and one on the treble side. This one has one hole centered on each side FYI. This is the treble model. Includes box, instructions, and pickup like new. All wires in great condition. I have installed dozens of pickups. 75.00 delivered to US lower 48. For other locations, PM me. Will trade for Bartolini BD5CBC-T, CF5CBC-T, M45CBC-T, M4 (EMG40 shape). Basically a Bart that's roughly 1.5"x4". Thanks.