In the photos I've seen they appear to be printed on white cardstock, but it's hard to determine the exact weight of the cardstock. In some photos the cards appear a bit flimsy while in others they appear to be a bit thicker. From what I can tell the vaccination kits from the CDC include the cards. I haven't yet found any Federal guidelines on vaccination card specifications or RFQs, but that might not be a bad approach to take if one took an interest in such things.

Edit: This is probably the best photo I've found to help illustrate how thick the cards are. I count about 50 cards in that right stack, and it's a fair bit taller than the phone.

In the photos I've seen they appear to be printed on white cardstock, but it's hard to determine the exact weight of the cardstock. In some photos the cards appear a bit flimsy while in others they appear to be a bit thicker.

From what I can tell the vaccination kits from the CDC include the cards. I haven't yet found any Federal guidelines on vaccination card specifications or RFQs, but that might not be a bad approach to take if one took an interest in such things.