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: #9Top Window Size: 7/8" x 3 7/8"Top Window From Left Side: 3/8"Top Window From Bottom: 2 1/2"Bottom Window Size: 1" x 3 7/8Bottom Window From Left Side: 7/8"Bottom Window From Bottom: 3/4"Weight: 24#Material: White WoveInk Color: BlackFlap Opening: LongSeal: Moisture