The Ibanez RG550MXX is an RG series guitar model and a reissue of the original RG550 in honor of its 20th anniversary in 2007. The reissue has a few features and specs which were not typical of 2007-era models: the Edge tremolo, the original neck joint and a 1987-style Wizard neck. The main difference between the reissue and the original is the neck: instead of a one piece maple neck, the reissue has a five piece maple/walnut neck more common on modern Ibanez guitars.
There was also an RG550 reissue available with a rosewood fingerboard, the RG550RXX. Each RG550*XX came with a matching finish RG 20th anniversary case, strap and picks.