Use this First Class Mail double window envelope 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. This 9 1/2 x 11 1/2 envelope is constructed of 28lb paper Top Window Size: 2 1/4 x 4 1/2 Top Window From Left Side: 2 3/4 Top Window From Bottom: 6 1/2 Bottom Window Size: 2 1/4 x 4 1/2 Bottom Window From Left Side: 2 3 Ships direct from the plant in 48 hours or less Additional Details ------------------------------ Product description: Use this First Class Mail double window envelope 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. This 9 1/2 x 11 1/2 envelope is constructed of 28lb paper Top Window Size: 2 1/4 x 4 1/2 Top Window From Left Side: 2 3/4 Top Window From Bottom: 6 1/2 Bottom Window Size: 2 1/4 x 4 1/2 Bottom Window From Left Side: 2 3