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.