Item Number 99ENVA 1099 Double window envelope for high-speed processing machines. Works with most 3up format 1099 and 1098 forms. Check measurements below for compatibility with your forms Size: 3 15/16 x 9 3/16 Top Window Size: 1 x 3 5/16 Top Window From Left Side: 9/16 Top Window From Bottom: 2 5/16 Bottom Window Size: 1 1/8" x 3 5/16 Bottom Window From Left Side: 9/16 Bottom Window From Bottom: 3/4 24 pound white wove paper stock Ink Color: Black Flap Opening: Long Seal: Moisture Ships direct from the plant in 48 hours or less