Blake Purely Everyday C4 324 x 229 mm 120 gsm Pocket Self Seal Window Envelopes (14892) White Pack of 250

Amazon

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

Zoro Tools

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