: The index cards are made of paper material, double-sided writing, smooth writing and not easy to bleed ink. It can be used freely with loose-leaf loops 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 Various Colors: These flash cards in blue, green, yellow, , pink and white in bright, fade- colors that can be to match the project Wide Use: These study cards are suitable for note taking, making , shorthand, notes, cue cards, and for home office school use Colour:Mixing Color Material:Paper Package Contents: 300sheets x 3x5 inch index cards 6 x rings (6 colors, 50 sheets of each color) 100 x colored index tabs 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.