If you haven’t heard yet, Nike’s dropping the MAG sneaker, one you might remember from the 1989 Back to the Future II movie starring Michael J. Fox. Nike announced that 1500 pairs of this shoe will be auctioned on eBay, nikemag.eBay.com, with all net proceeds going directly to the Michael J. Fox Foundation. The auctions have begun and will end on September 18 with 150 pairs to be posted on eBay per day for 10 days.