These are some index cards with binder ring, which makes them easy to use and take. These cards are practical for you to DIY your own study cards, like vocabulary cards, notepads, memorandum and so on. It's perfect as studying or working supplies for students, or office workers to bring them more convenience. Features - ColorAssorted Color - Material: paperboard. - Size: 9.00X5.50X1.60cm/ 3.54X2.16X0.63inch. - Note: Each index card contains 50 sheets. - Made from paperboard material, which is safe and for using. - Can be easy to install and keep them together, convenient to use or take down the note card. - Different colors enables you to make special marks according to different themes and colors, convenient for writing all kinds of information. - Iron binder ring design, portable and convenient when turning pages, save time and efforts. - Widely applies as alphabet cards, word cards, vocabulary cards, notepad card and more. Package list: 30 x Vocabulary Notepads