HOUSWEETY 12pc Mixed Antique Tibetan Silver Carved Hook Bookmarks [Office Product] Hole size: 2.5mm Thickness: 3mm; Main Colour: not shiny silver tone(dull silver tone); Material: Zinc metal alloy, nondeformable,Lead and nickel free; High quality bookmark.You can place some long ribbon to the ends of the loop; You can also use them as a charm for your jewelry DIY.