Blake Purely Everyday C4 324 x 229 mm 90 gsm Pocket Self Seal Window Envelopes (12878) Manilla Pack of 250

Amazon

Easy to use Self Seal closure High quality 90 gsm paper Perfect for business correspondance, letters, brochures and more Window: 40 x 105mm, 213 up, 24 left

Zoro Tools

Catering for all sizes in wallet, pocket, gummed and self-seal envelopes. A range of paper grades available, all with excellent environmental credentials.