B4 White Gusset Window 140gsm Peel & Seal Envelopes. B4 size envelopes, which is 'oversized C4' so designed to fit A4 and a little bit more (so great for A4 folders). The gusset expanding sides makes these envelopes perfect for bulkier brochures/documents. Envelope dimensions are 250mm x 352mm with 25mm gusset.
These envelopes are made from high quality, strong 140gsm paper and feature an address window, plus a blue opaque security print inner, so prerfect for business mailings.
Opening is on the short edge of the envelope (pocket style) with a peel & seal closure.
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