The set includes index labels in a variety of different colors, providing a practical and versatile solution for color-coding and organizing documents and catalogs. The index tabs are made of high quality PET material with a special adhesive that is waterproof, non-toxic and odorless. You can use most pens, markers and highlighters for smooth, legible writing on the tabs. The translucent design of these index tabs allows you to see and mark important information as you use the tabs, making them a practical and convenient tool for finding information faster and easier. With removable adhesive for repositioning and reuse, these tabs stick firmly and securely enough to turn pages without damaging books or documents. Index tabs are great for planning, organizing, prioritizing and personalizing work, making them ideal for marking, labeling and highlighting textbooks, documents or schedules. They are perfect for home, school or office use