4-1/8" x 9-1/2" ( 4.125" x 9.5" ), Double Window Envelope, Top Window 1-3/8" x 4" Window, 5/8" From Left, 2-1/4" From Bottom; Bottom Window 1-1/4" x 4" Window, 5/8" From Left, 5/8" From Bottom, White Wove Paper, Remoistening Seal, 500 Qty / Box.