Quality Park Park Airmail Envelopes, 4.125 x 9.5 inches, 10, Box of 500 (16210) White 4 1/8 x 9 1/2 airmail envelope features a gummed closure. Envelope is security tinted with a preprinted Airmail symbol with red and blue border. Features a red and blue border with standard airmail symbol. Blue tint interior. Fully gummed flap.