A9 Invitation Envelope - Astrobright - 24# Gamma Green (5 3/4 x 8 3/4) - Announcement Envelope Series (Box of 500) A Quantity of 500 - A9 Invitation Envelope - Gamma Green 24# Astrobright Gamma Green paper - Regular Gummed Flap Perfect for Greeting cards, Weddings or any announcement. This envelope may be sourced from any one of a number of top brands. Ships via UPS Ground