Smart Stacks are educational index cards designed to help students learn faster, retain information better, study more efficiently, and focus longer. Use them just like a typical index card: on the green side write the word, fact, or formula being studied; on the yellow lined side, write the definition or explanation. The brain, eyes, and mood are positively affected by Smart Stacks' colors, shapes, and shading to help students study more efficiently and effectively. They specifically help the learning experience of students diagnosed with ADD/ADHD, Dyslexia & Autism. 3"x 5". Each pack contains 100 index cards.