The Lo-Pro is a minor redesign of the original Edge tremolo to give it a lower profile (hence the name). On the original Edge the string clamp bolts pass under the fine-tuners, while on the Lo-Pro Edge, they do not. This design change means that the Lo-Pro doesn't protrude as far from the top of the body and thus interferes less with the players picking hand and arm. A version of the Lo-Pro called Lo-Pro Edge 7 for seven-string guitar models (including Steve Vai's signature Universe UV77) was also introduced in 1991. Portal: Tremolo bridges | Parts File:Parts-icon.png