These PFA films are an original replacement product for the Mars 4 3D printer from Elegoo. These release films are wear-resistant, chemical-resistant and have a non-sticky surface, which prevents the resin from sticking to it. The film has a smooth surface without wrinkles, scratches or bubbles. This allows the resin to adhere evenly to the film and your 3D print has a high quality. These PFA films allow up to 95% UV light to pass through, for faster and more precise curing of the resin. Finally, the lifespan of these PFA films is 50% longer than that of normal release films, which means they can handle up to 9,000 releases. These PFA films are 130mm x 200mm, 0.127mm thick and come in a pack of 5.