Columbian CO298 Greeting Card Envelopes, 5-3/4" x 8-3/4" A9 White (Box of 100) Envelope is designed for computer generated invitations, greeting cards, announcements and more. Sized to hold a 8-1/2 x 11 Inches sheet folded in half. Premium 24lb white wove stock. Side seam construction. Moisture activated gummed seal. 5-3/4 x 8-3/4 Inches A9 Standard Size 100 envelopes