【Sturdy Material】Our index cards are made of sturdy paper that absorbs ink without leaving any marks on the back. Whether with a pencil, ballpoint pen, fountain pen or marker, they are versatile and easy to annotate.【Variety of Colors】Each index card measures 5" x 3", with 6 different colors, 100 sheets per color, supplied with 6 binder rings and 12 kraft paper covers, they are perfect for your daily needs.【Double-sided Writing】Our flash cards are printed on both sides, allowing you to use both sides to write. The smooth surface provides a comfortable writing feel and makes them resistant to frequent use.【Easy to Carry】Small, lightweight and space-saving, they are ideal for travel or for use at school. These flashcards fit easily into purses or backpacks.【Versatility】Whether at school, the office, at home or on the go, these review flashcards are ideal for taking notes, learning vocabulary, recording tasks and much more. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.