Roptex® (Brown Kraft) Open End Catalog with Kwik-Tak®Open End Catalogs have their opening on the short dimension. These envelopes are manufactured with durable, SFI Certified Brown Kraft paper, center seam construction and a pressure-sensitive seal that requires no moisture. Release tape covers the adhesive until the envelope is ready to seal.Brown Kraft (SFI CERTIFIED)Vellum Finish Center Seam No Window Pressure Sensitive Seal Flap Down