Approximate breakdown is 60% baseball, 15% basketball, 15% football, 10% hockey.  Mostly commons but stars are included.  Taken from a collection of over 900,000 cards that I recently acquired.  Cards taken from 80s-present from a wide variety of years, brands and players.  Premium brands are included.  If you look at my feedback, people have been happy with these lots.  Free shipping too!