Other refinements include a strings-through-body/top-load bridge, Posiflex graphite neck support rods, rolled fingerboard edges, highly detailed nut and fret work. Five-string versions are presented with a 4+1 tuner arrangement and two Hipshot string trees since 2002. The asymmetrical five-bolt neck plate, along with the smooth contoured heel allow much easier access to the upper registers. Bound fingerboards with pearloid block inlays were added with the introduction of the American Deluxe Jazz Bass FMT & QMT in late 2001, featuring flamed or quilted maple tops and gold-plated hardware. Fender discontinued these models in 2007.