Martial Arts Birthday Thank You CardsMartial Arts thank you cards feature martial art silhouettes in cool poses. Could be used for Karate, martial arts or Tae Kwon Do parties for a fun 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 handwritten note Easy to use because all you have to do is simply fill in and mail out 10 cards and 10 white envelopes included 4.