[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.