Use this double window envelope for convenience when mailing statements and invoices. To confirm compatibility with your forms, order a free sample or call our customer service team.Specifications:Size: #10Top Window Size: 7/8" x 3 1/2"Top Window From Left Side: 3/8"Top Window From Bottom: 2 5/16"Bottom Window Size: 1" x 4"Bottom Window from Left Side: 3/8Bottom Window from Bottom: 1/2" Weight: 24#Material: White WoveInside Tint: BlackFlap Opening: LongSeal: Self Seal