We took those messy old stacks of index cards and gave them an instant upgrade. Keep your cards organized with this 4 pack of durable and colorful doodle themed snap-closure carrying cases. And that's not all. We've included 100 3"" X 5"" College-ruled index cards and five color dividers with customizable tab stickers for easy organization in each. But the studying part? That's all up to you. You buy, Yoobi gives - for every Yoobi Item you purchase, a Yoobi Item will be donated to a child in need, right here in the U. S.