A6 Invitation Envelope - Astrobright - 24# Gamma Green (4 3/4 x 6 1/2) - Announcement Envelope Series (Box of 1000) A Quantity of 1000 - A6 Invitation Envelope - Gamma Green 24# Astrobright Gamma Green paper - Standard Gummed Flap. Perfect for Greeting Cards, Greeting cards, Weddings or any announcement. This envelope may be sourced from any one of a number of top brands. Ships via UPS Ground