This package includes 3200 index tabs in 16 packs, with 20 pieces per color and 160 different colors, providing a practical and versatile solution for color coding and organizing documents and catalogs. Mr. Pen index tabs are made of top quality PET material and special adhesive, waterproof, non-toxic, and have no odor. Using most pens, markers, and highlighters, you can get smooth and clear writing on the tab. The translucent design of these index tabs allows you to see important information and mark it while using the tabs, making them a practical and convenient tool for finding information more quickly and easily. Featuring a removable adhesive, these page sticks are repositionable and reusable, sticking securely and strongly enough to turn pages without damaging books or documents. Mr. Pen index tabs are perfect for planning, organizing, prioritizing, and personalizing work, making them ideal for marking, tabbing, and highlighting textbooks, documents, or planners.