Supplied between thick paper for easy trimming. The simple instruction label highlights eye safety and application issues. The inscription "silver sides facing the sunβ could be in bold β for asymmetrical designs; (I got lucky with a 50/50 chance)! I cut 1" and 1/2" styrofoam rings, inserted filter material in between and glued them together for small telescopes, binoculars and cameras in preparation for the August 21, 2017 solar eclipse.
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