The Slip (also known as Halo 27) is the eighth major studio release by American industrial rock band Nine Inch Nails. The album was released free of cost on May 5, 2008 via digital download on the official Nine Inch Nails website. The album was made available without any prior notice or advertisement, and in a similar fashion as the band's previous release, Ghosts I–IV, released two months earlier. The album was produced by Trent Reznor alongside Atticus Ross and Alan Moulder.