Diffraction Grating sheet 500 lines per mm Linear 5ft

It is what it is!Came in a plastic bubble padded envelope. Inside was a plastic bag. Inside the bag was a roll of the diffraction film. Each layer was quite hard to break into, considering. But that's ok. I'm just glad it was in a roll. The cut on the film was rough on the short side, machine factory cut on the long side. It seemed there were fingerprints or something similar on the film. I washed the piece I cut off with regular soap and water, it seems perfectly clean. I have no real complaints.