also check for marks where they have been chucked up in a tire changer, i personally would want a set of wheels that has had more that 3 or 4 sets of tires on them, check for wheel weight stains, signs of repainting (if they are Painted) and beware of the extremely good bargain, dont jump on them because they are cheap, be sure its legit, dont buy stolen wheels either, question where they came from, dont be afraid to ask if they are stolen, just watch the owners reaction to tell if he is lying or not.