Zombie Infection Thank You CardsZombie Infection thank you cards feature a zombie infection sign and a green swirl background. Complete with blood splatters to make it feel real, a perfect way to send your thanks. Some features of our thank you cards: Professionally printed on 80# cardstock paper so you feel the quality. Teaches children how to send a meaningful hand written note Easy to use because all you have to do is simply fill in and mail out 10 cards and 10 white envelopes