Valid for 7 (consecutive) days travel on the Japan Rail network all the way from Kyoto in the east to Nagasaki in the west, including the Sanyo Shinkansen between Shin-Osaka and Fukuoka’s Hakata station. Its wide are of coverage means that its price approaches that of the 7-day nationwide rail pass, but does offer a saving if you do not intend to travel into the Tokyo area.
It can be bought on this website, or at major railway stations in the area covered (at a slightly higher cost). It cannot be used by residents of Japan.