[WHAT YOU GET]Adequate quantity to meet your daily study and work needs. [PREMIUM QUALITY] Our flash cards are made of high-quality thick paper, durable and safe to use, suitable for a variety of pens, smooth for writing, no ink bleeding concerns, not easy to tear and break, can be used for a long time. [PERFECT SIZE] compact and portable, so you can put the cards in your pocket or backpack, easy to take out and record at any time. Come with 11 pieces of stainless steel binder rings, makes it easy to organize the cards together, convenient to hang or take down the cards. [DOUBLE SIDED DESIGN] Flashcards with double-sided printing, ruled on two side for easy note taking, you can use for both sides of the writing which is more economical paper. In addition, come in 10 vibrant colors will improve your learning efficiency and facilitate classification. [MULTIPLE APPLICATIONS]Our colorful note cards can be widely applied in your home, school, university, college, office. Perfect tools for studying or working, systematic study of words, formulas and arithmetic, preparing for an exam, making a list, note taking and more! size: 12.7 x 7.6cm Material: Paper colour: random color Note: randomly colored. Cannot be chosen the specific color. Package Contents: 1000 sheet x Index Cards(100 sheets per book, 10 books in total) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.