3M Post-it Flags Rainbow are film-based index tabs for systematically categorizing and marking important content in documents or textbooks. They come in two sizes, 44*6mm and 44*12mm, allowing for selection based on the intended use, and include a total of 140 sheets. With vivid colors for excellent readability and the ability to be attached and removed cleanly, they are essential stationery items that help with efficient document management during office work or study.