Set of 100 A2 white envelopes measuring 4.375x 5.75inches, fits all 4×5 cards. All 4×5 envelopes are made of 120GSM paper, thick and opaque. The self-sealing design is simple to use and easy to seal and peel. Envelope 4×5 can be printed and DIY to create a unique envelope cover. A2 Envelopes are versatile and can be used for invitations, photos, Christmas, wedding invitations, birthdays, baby christenings.