Blake Purely Everyday 120 x mm 100 gsm Square Wallet Gummed Envelopes (0120SQ) White Pack of 500

Amazon

Gummed flap for a long shelf life and reliable sealing High quality 100 gsm paper Straight flap A square envelope always enhances a mailing and with this range available in Europe, this gives infinite opportunities for provocative direct mail

Zoro Tools

A square envelope always enhances a mailing and with the largest range available in Europe, this gives infinite opportunities for provocative direct mail.