The Nike Mag, based on the sneakers seen in the popular motion picture Back to the Future II, is finally in existence.

The NIKE MAG is no longer the “greatest shoe never made.” The mythical shoe that originally captured the imagination of audiences in Back to the Future II is being released – and they’re here to help create a future without Parkinson’s disease.

1,500 pairs are under auction at eBay to benefit the Michael J. Fox Foundation. Bids are already hitting five-figure sums.