Envelope-T4, Window 5-3/4' X 9" Security 24Lb White 25/Pack

"Supremex T4 envelopes are ideal for mailing standard income tax forms and more. Security Artline. Open Side. 5-3/4"" x 9"". Bottom Window Size: 1-15/16"" x 4-1/4"". Bottom Window Placement: 1-1/4"" from bottom. 24 lb. 25/pkg. Made in Canada."