Item Number 91580 (replacement item TF99991) Compatible envelope for 4 up style W-2 tax form Double window envelope compatible with the 4 up condensed, W-2 laser format tax form. Measurements: Envelope: 9 x 5 5/8 Top Window: 3 7/8 x 5/8 - 5/16 from left, 3 9/16 from bottom Bottom Window: 3 5/8 x 11/16 - 4 1/2 from left, 2 1/2 from bottom Pricing is for 25 IRS Approved Tax Form Envelopes