155mm Square Storm Grey Peel & Seal Wallet Envelopes (120gsm) - The Envelope People
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C5 Grey String & Washer Envelopes [Qty 100] 229 x 162mm – All Colour Envelopes
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110 x 220 Dark Grey DL Envelopes | Peel/Seal | 120gsm | Pack of 125 • Colour Stationery
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50 x Envelopes Grey / Blue DIN C6 Format 11.4 x 16.2 cm - Self-Adhesive - Envelopes without Window - Christmas, Greeting Cards & Invitations - For A6 & A4 Paper : Amazon.co.uk: Stationery & Office Supplies