Combined use of articulating film, foil and paper to mark high and low occlusion points provides the most accurate way to mark every point of articulation. Proprietary manufacturing process combined with stringent quality control guarantees a clear, positive marking without smudging of wet or dry fields. Color-coded packaging and product descriptions make identification easy. Not made with natural rubber latex. 0.0028", 12 sheets per book, 12 books per box.