Additional Details ------------------------------ Product description: Item Number CLNT9FPS10 Patriotic 1040 window Income Tax Return Envelope with 1040 Window and Peel-and-Close Flap. Use this Income Tax Return window envelope with a Peel-and-Close flap to easily mail any tax return or report. A blue interior tint adds security while the cellophane window allows the taxpayer name and address to clearly show through. Add a professional touch by imprinting your return address on the back flap if you choose. This 9 1/2 x 11 1/2 envelope is constructed of 28lb paper Size: 9 1/2 x 11 1/2 Top Window Size: 1 5/8 x 5 3/8 Top Window From Left Side: 1 inch Top Window From Bottom: 8 5/8