The special feature of these HP Premium laminating films, besides the thicker film thickness of 125 microns, is the ring binder perforation, which is suitable for all DIN A4 folders. This means your laminated documents will not be damaged when archived. The transparent laminating covers with glossy surface can be used for all hot laminators, provided the micron number specified... by the manufacturer is not exceeded. The films are for hot lamination only and have a size of 228 mm x 303 mm. You will receive the laminating films in an envelope containing 25 pieces.