Insert these cards into the Fastpass machines at the TOP rides in Disneyland and you will get a Fastpass ticket for that ride giving you a time to go back. You then go back to the ride at that time and wait no longer than 10 minutes to get on.
These cards never expire. Myself and my girlfriend used them last summer and got on ALL the top rides in one day including both parks! We were gettin off one ride and going straight on another - brilliant and stress free!