Quality Park No. 10 Single Window Envelope with a Self-Seal Closure - Single Window - #10 - 4 1/8" Width x 9 1/2" Length - 24 lb - Self-sealing - Wove - 500 / Box - White

No. 10 Redi-Seal Window Envelopes require no moisture. Raise the lower flap and press. Unique double-flap design keeps gum from sticking until mailing. 1-1/8" x 4-1/2" window is positioned 7/8" from left and 1/2" from bottom. Envelopes are made from 24 lb. white wove stock.