Glowing In Dark Reading Marks, It's a special bookmark, you can find your bookmarks in the darkness faster than normal bookmarks.Material: Metal Dimension: app.12.5cm/4.92inType: Luminous BookmarkIt is a special bookmarks,you can find your bookmarks in the darkness faster than normal bookmarks.After absorbing enough light during the daytime,the bookmark will glow for up to 2-3 hours after normal sunlight exposure.Occasion & Gifts: use it at school, office, home, outdoor, it's convenient for you to carry it. You can also send it to your family members, friends, lovers and business partners.Note:-Please allow 1-2CM differs due to manual measurement.-Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding.