Customized Stationery & Notebooks, Plastic Ruler Bookmark - 10 mil, Surpass levels of promotional success with this plastic bookmark! A promo product any bookworm is sure to love, this unique bookmark features a ruler print. Customize with a four color process imprint on one side - a great way to promote an author, book club, library and educational events! The ideal size of this item makes it a perfect tote bag insert at conferences. ... #PSK01 $0.70/each.