Size C4 Plain - 324x229mm, 90gsm. Size C4 Window - 324x229mm, 90gsm. Size C5 Plain - 229x162mm, 90gsm. Size C5 Window - 229x162mm, 90gsm. Product Type: High quality plain white self seal envelopes - available with or without window in sizes C4, C5 & DL.
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