These nFEP release films are a genuine replacement part for the Uniformation GK3 Ultra 16K 3D printer. The films are 15.4 x 10.4 inches and are only 0.15mm thick. They are high quality, heat resistant and durable, making them very suitable for long term use. When you notice that your 3D prints are of less quality or if you see that your current FEP film is damaged, it is time to replace your FEP film. The package contains 3 pieces.