I purchased these 5mm earrings for myself after I lost my nice expensive pair.  These are great for everyday usage.  The backs are very small, but i interchanged the backs with a larger set I already had.  Worked like a charm.  I sleep in these very comfortably!  I also have very sensitive ears and these have not bothered my ears or shown any discoloration.  Will buy from Gem Avenue again, just can't beat the price!