Blake Purely Everyday 190 x mm 100 gsm Square Wallet Gummed Envelopes (0190SQ) White Pack of 500

Amazon

Gummed flap for a long shelf life and reliable sealing High quality 100 gsm paper Ideal for invitations, greetings cards and more Package Dimensions: 30.2 L x 20.6 H x 20.6 W (centimeters)

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.