You are purchasing a good plus to very good condition set of the Complete Mars Series by Edgar Rice Burroughs. One book has a name inside front cover.  Several have rub marks especially on the back covers.  There are a few corner and reading bends.  The page blocks have some discoloration.  But many of the books are in VG+ condition, so this set has a bit of a condition range, but is a very nice set, nevertheless.