Use this double window envelope for convenience when mailing checks. To confirm compatibility with your checks, order a free sample or call our customer service team.Specifications:Size: #10Top Window Size: 1 1/8" x 3 1/2"Top Window From Left Side: 7/16"Top Window From Bottom: 2 1/16"Bottom Window Size: 7/8" x 3 1/2"Bottom Window From Left Side: 7/16"Bottom Window From Bottom: 5/8"Weight: 24#Material: White WoveFlap Opening: LongSeal: Moisture