Western Sulphite® (White Wove) Open End Catalog with First Class Border and Pres-Stik® Open End Catalogs have their flap on the short dimension. These envelopes are manufactured using SFI Certified white wove paper, center seam construction, a preprinted first class border - with "First Class Mail" on the face - and a self-sealing latex adhesive.White Wove (SFI CERTIFIED)92% Brightness Vellum Finish Green Diamond Border “First Class Mail” on Face Center Seam, No Window Self-Sealing (Latex Adhesive) Flap Extended