So many technical terms. This is not how Martina envisioned her studies: Her chemistry program includes many elements of the periodic table as well as numerous chemical formulas that she needs to memorize. At first, she was surprised, but then she found a very effective system to write down and learn all these formulas and details: flashcards. And what is the easiest way to sort flashcards? Durable has created a very useful tool for this with the card box system (not included) and this index card organizer. It not only neatly sorts chemistry formulas but also addresses or other details in alphabetical order. This way, you can find what you're actually looking for much faster. The individual sheets are made of durable plastic.