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A straight line diffraction grating sheet 500 PCs per 1 mm Width 6 30 cm x 15 cm (1 'x) Thousand Oaks Optical (sauzando・o-kusu・oputexikaru) in high quality products. For over 30 years the manufacturer, with a secure sun observation filter manufacturer's comments in the substrate to protect the filter effects thanks to powerful than maira-firumu. 5 year manufacturer warranty " Please note – this product is the educational quality. Random dents/spots/Small Amounts Of wrinkle, spots and dust may not included. This is a top quality please please note that is not a problem. This is perfect for educational purpose and need a quality level.