Western Sulphite® Open End Catalog with Window - Open End Catalogs have their flap on the short dimension. These envelopes are manufactured with white wove SFI Certified paper, center seam construction, a poly window and a traditional remoistening seal.White Sulphite (SFI CERTIFIED)92% BrightnessVellum Finish Center SeamPoly Window Remoistening Seal Flap Down