Quality Park 24529 - Double Window Tinted Redi-Seal Check Envelope, #9, White, 500/Box Type: Specialty Envelopes Color: White Sizes/Dimensions: Envelope Size: 3.88 x 8.88 Quantity: 500 Specifications: Holds standard 8-1/2 x 11 invoice forms Window size: 1-3/16 x 3-1/2 Top, 1 x 4 Bottom Window placement: top window is 3/8 from left and 2 from bottom, bottom window is 3/8 from left and 1/2 from bottom 24 lbs. white wove paper