I am considering prepurchasing 4-day Hopper Passes through AAA and just wondered what the AAA passes are made of? Are they the plastic 'credit-card type' that are issued at WDW? If not, do they hold up pretty well with all the 'hopping'. Also, I think I read somewhere about exchanging paper passes for plastic once you arrive at WDW. Does anyone have any experience doing this? Is it worth the time? Thank you in advance of the info.