Blake Purely Everyday DL 110 x 220 mm 90 gsm Window Self Seal Wallet Envelopes (13884) White Pack of 1000

Amazon

Easy to use Self Seal closure High quality 90 gsm paper Perfect for business correspondance, letters, brochures and more Window: 35 x 90mm, 18 up, 19 left

Zoro Tools

A vast array of white envelopes catering for every size. With gummed, self-seal, pocket and wallet varieties available.