The Acid-Free Glassine Envelopes - Pack of 100 (Size #6) is a product designed for stamp collectors and other enthusiasts who need a storage solution for their valuable items.
These semi-transparent envelopes are made from #30 glassine and are available in standard envelope sizes of #1 through #12. The Size #4 glassine is perfect for storage of Plate Number Blocks, while larger glassine envelopes can be used to hold your covers collection.
These envelopes are acid-free, making them ideal for long-term storage of stamps, negatives, plates, seeds, and etymology specimens.
Scott Numbers and identifying information can be written on these envelopes, but it is recommended that writing should be done before stamps are placed in the envelope to prevent the impression of the writing onto the stamps inside.

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The Size #4 glassine is ideal for storage of Plate Number Blocks and Larger glassine envelopes can be used to hold your covers collection.
100 - Glassine Envelope #6. The Glassine Envelopes are available in standard envelope sizes of #1 through #12.