Bring the excitement of mystery packs into your classroom! Each mystery pack contains a collectible eraser, a story about your fantasy friend, comprehension questions, and a "just for fun" activity! Erasers measure approximately 1.25" tall. Collect them all! Each mystery pack contains one eraser and a special insert. Each set includes 20 mystery packs. Sold as 2 sets for a total of 40 mystery packs (40 erasers).