TerraSlate Copy Paper Waterproof Laser Printer, Rain Weatherproof, 4 MIL, 8.5x11-inch, 50 Sheets WATERPROOF PAPER: rip proof and weather-resistant paper. Can hold up in any environmental condition WEATHERPROOF: Tough enough to hold up to harsh weather, chemicals, mud, grease, sweat and excessive handling EXCELLENT IMAGE QUALITY. This tough material has incredible tear strength and is perfect for applications that need to last RECYCLABLE: Completely recyclable wood-based paper as a #7 mixed recyclable VERSATILE: Prints on both sides through any laser printer or copy machine (does not print in inkjet printers). Works with pencil or all-weather pen