Science Birthday Thank You CardsScience thank you cards feature a background of bright colorful elements from the periodic table. Included are images of microscopes, vials and flasks to make it feel like a real science lab, 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 handwritten note Easy to use because all you have to do is simply fill in and