Fresnel lenses are great as reading aids, magnifiers or for use in DIY projection projects. This lens is great for reading fine print in books, magazines, menus, maps, telephone directories, etc. Makes a great gift for those who need a visual aid. They can also be used for light duty solar such as heating water and solar furnace projects and more. Measures 7.00″ x 10.25″ (Inches). Material: Optical PVC. Magnification: 3X. Quantity: Pack of 5.