Top Quality: These lined spiral index cards are made of high quality, smooth and thick paper, compatible with all types of pens, such as ballpoint pens, ink pens, etc. No ink leakage. Durable and Wrinkle-Resistant. Tear-off and Coil-Bind Design: Our colorful index cards come with a dotted line, you can tear each sheet from the card in seconds like a sticky note. (Tips: The paper is thick, first fold along the dotted line before tearing it off). The spiral rings ensure smooth rotation.Clear Frosted Cover: These flashcards have a clear frosted plastic cover which can protect from water. Rotate the cover as a base when writing and for comfortable writing.Colorful flash paper: You will receive 4 card stock, 4 colors (pink, yellow, green and blue), each color contains 50 sheets, 200 sheets in total. The size is 8 x 12.5 cm. It is the best gift for your kids or friends.Wide Applications: These color ring binder cards are suitable for study, note taking, color coding projects, index card making, checklist making , etc. You can use them at home, school and office for your convenience. Note: The data are all manual measurement, please allow 1-3cm error, due to the Light and display difference, there will be some color difference, depending on the physical object received.