Usage Tips:Index Card SetYou will receive 10 packs of spiral bound lined index cards, each pack contains 50 cards, total 500 cards, 5 colors (white, pink, yellow, green and blue), 2 packs of each color These spiral bound colored index cards are made of 110gsm thick paper, durable, wrinkle-resistant, smooth and suitable for writing; they measure 12.5 x 7.5 cm, compact and portable Spiral Binding & Tear-Off DesignThe spiral binding allows the lined review cards to unfold 180 degrees for easy writing, you can easily tear each review card along the dotted line to use as a flashcard Transparent Frosted CoverThese blank colored index cards feature a transparent frosted plastic cover to protect and waterproof them; they can be opened to serve as a stand when you write, making them easy to use and write Multifunctional Index CardsThese lined ring index cards are ideal for studying, taking notes, color coding projects, creating flashcards, making lists and much more. For your convenience, you can use them at home, school and office