6"x 9" Poly Window Open Side Booklet Envelope #1 Window 1-1/8" x 4-1/2" Window Size, 7/8" From Left, 1/2" From Bottom Western Sulphite White Sulphite Paper Paper Color: White SFI Certified Vellum Finish Side Seam Flap Down Remoistening Seal 500 Qty / Box 2500 Qty / Ctn 11 lbs. per Box