3-7/8" x 8-7/8" ( 3.875" x 8.875" ), Double Window Envelope, Top Window 1" x 3-1/2" Window, 5-16" From Left, 2-5/8" From Bottom; Bottom Window 1-1/4" x 3-1/8" Window, 3" From Left, 1-1/16" From Bottom, White Wove Paper, Quick Stick Seal, 500 Qty / Box.