For demanding underwater applications， DuraCopy water proof paper is unrivaled in endurance， performance， and ease of use. Synthetic paper is completely waterproof and holds strong underwater. Tear resistant， but can be cut， punched， and perforated. Simply print your document onto DuraCopy paper from a laser printer， and your document will be ready to brave any adventure paper products typically can't survive. Your dive logs， maps， and other documents will be safe， even in periods of prolonged submersion. DuraCopy paper can be marked with pencil or all-weather pen. When dry， also use a ballpoint pen， permanent marker， and other popular writing utensils. Even deep underwater， DuraCopy products will keep your notes and documents intact. Ideal for use in laser printers， such as: HP， Brother， Lexmark， Canon， Epson， and Xerox. Not for inkjet printers. When wet， use a standard #2 pencil an all-weather pen. Standard ballpoints and permanent markers will work when paper is dry. Water-based inks will bead or wash off. Will not melt or collect a static charge in printer. Can be recycled at any residential or commercial facility that accepts 1-PET classification materials.