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These top-opening glassine evelopes are preferred by insect collectors. They are made of 30 lb. glassine to provide maximum protection and humidity resistance. The large 3 x 5" size allows you to include a standard 3 x 5" file card with your specimens. One pack of 100 envelopes.
Glassine envelopes are a safe way of storing butterfly specimens (with wings folded) until you're ready to pin them in a collection.
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