Check the listing for details. Full Page Magnifying Sheet Fresnel Lens 3X Magnification Reading Aid 7 x 10.25". Condition: New. Listed at 4.88 USD. Large Plastic FRESNEL Sheet Lens Buy 3 Get 1 Free This item is a brand new full page Magnification Sheet/FRESNEL Lens Sheet measuring 7" X 10"Description Thickness: 0.4mm Weight: 44 grams Material: optical PVC Groove pitch: 0.3mm Focal length: 30cm (~1 FT) Size: 7 inch x 10 inch Reading aidLarge size and light weight. Hold the lens a few inches above the prints to make a good magnification. Solar Applications This Fresnel lens is also very good for experiments of gathering solar energy. Thanks for its large size, it usually can start a fire within 2 seconds in a normal sunny day. I personally can use it to start melting an aluminum can around 45 seconds under Florida sunshine. Try it your ways to boil a bottle of water, start a camp fire, or build a water heat pipe, etc. I guarantee that you have a lot fun!Why buy from us? The lenses are carefully packed, so you do not get lenses with scratches. We ship from Florida, US and you usually get the item in 3 to 5 days for US can 5 to 7 days to Canada.Shipping and Handling The package will be shipped within 24 hours from FL after receiving the payment. US buyers only.If you buy 3 lenses, just pay for the 3 and we will include the 4th one for free. This listing is a positive lens. For negative Fresnel lens as a wide angle rear window safety lens for SUV and mini vans, please check my other listing items or contact me. We have 8 x 10 wide angle rear view lens for sale.Thank you for looking. Happy bidding.