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Postmaster Envelopes PEFC Mailing Machine Wallet Gummed with Window 90gsm DL 114x235mm White Pack 500 The Postmaster Mailing machine envelope are Special flap profile envelopes designed to run on all known mailing machines. There are Board inserts in the box ensure product remains flat for optimum runability. They are Gummed sealing and have 'side seams inside' style of manufacture. They are wallet opening - meaning that they seal on their longer side.
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