 These short-lived American-made models were made by the Fender Custom Shop in the mid-1990s.The System I bridge string height is set by adjustable pivot post screws and has no individual string height adjustments but has individual string intonation adjustments and is very much like the Gibson Tune-o-matic bridge in terms of intonation and string height adjustments.The System I tremolo system uses a behind the nut string locking mechanism.