Made out of flexible PVC material with a reinforced edge. It's lightweight and won'for t break. fresnel Lenses designed for people with low for vision, seniors, hobbyists and professionals. The sheet is for ideal for reading small print on maps, instructions or books and has the ability to magnify full pages. Great for full page magnifier visual aids, fresnel lens solar projects, fire starter survival tools, and other daily house chores. Ultra-thin can be easily put into bag and wherever you go., Manufacturer: MOONDAME