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Use this "First Class Mail" offset window envelope to mail any tax return or report with software compatible or custom slip sheets. A blue interior tint adds security while the cellophane window allows the names and addresses to clearly show through. This 9 1/2" x 12 x 1" envelope is constructed of 28 lb paper and accommodates documents up to 1".
Expansion envelope has a sleeve to hold slip sheet in place.
To order a free sample, please contact us at 1-888-880-0463, or email@example.com.