JAPAN RAIL PASS, a joint offering of the six companies comprising the Japan Railways Group (JR Group), is the most economical means of travelling throughout Japan by rail. There are some restrictions on use; for example, JAPAN RAIL PASS cannot be used for travel on NOZOMI and MIZUHO trains on the Tokaido, Sanyo, and Kyushu Shinkansen lines. Passes can be used for 7, 14 or 21 consecutive days depending on the type, up to 90 days (3 months) after the Exchange Order is printed.