High Quality: The index cards are made of high quality paper material, double-sided writing, smooth writing and not easy to bleed ink. It can be used freely with loose-leaf loops<br> Compact and Portable: Index card size is 3inchx5inch compact and portable, can be put in the bag compartment side pocket, or in the jacket pocket. With the same color loose-leaf ring, easy to organize and store<br> Various Colors: These flash cards in blue, green, yellow, purple, pink and white in bright, fade-resistant colors that can be selected to match the project<br> Wide Use: These study cards are suitable for note taking, making flashcards, shorthand, checklist notes, cue cards, and for home office school use<br> Colour:Mixing Color<br> Material:Paper<br> Package Contents:<br> 300sheets x 3x5 inch index cards<br> 6 x rings (6 colors, 50 sheets of each color)<br> 100 x colored index tabs<br> Only the above package content, other products are not included.<br> 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.