Red A2 Envelopes, 5 3/4 X 4 3/8 - A2 Size 25 Envelopes A2 Size Envelope (4 3/8" x 5 3/4") Moistenable Glue Square Flap. Holiday Red 24lb bond / 60lb text (90 gsm) Paper Stock Square Flap. Inkjet & Laser Compatible.