Commit to Memory. We took those fumbly old stacks of index cards and gave them an instant upgrade. Keep your cards organized in this durable, elastic band-closure carrying case, which is clear so you can see exactly what's inside. 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. 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 classroom in need, right here in the U.S.