T-Rex Funny Greeting Cards and Envelopes - Dinosaur Party Novelty Item (12-Pack) Guajolote Prints Thank You Greeting Cards with Envelopes. 12 Count. Printed on quality 80lb Cover Card Stock. Funny T-Rex theme ideal for Parties, Birthdays and Special Occasions. Blank inside, ideal to write your own message. Envelopes included. Standard Size 3.375 x 4.875 inch (SMALL CARDS).