This pack of four Gotoh SSM-02 Saddle Shims are made from 0.2 mm thick brass and can be placed under the saddles of their GE1996T Double Locking Tremolo to change the radius of the bridge saddles (the shim goes under the front part of the saddle and has a hole in to allow the saddle mounting screw to pass through it). The GE1996T has a 350 mm (14") string radius as standard so shims would be added to the outer strings to flatten the radius for 16" guitars or added to the middle strings to tighten the radius for 12" or 10" guitars.