Western Sulphite® Commercial Window - This popular line of white wove commercial window envelopes is manufactured with diagonal seams, poly window and a traditional remoistening seal.White Sulphite (SFI CERTIFIED)92% BrightnessVellum Finish Diagonal Seams Poly Window Remoistening Seal Flap DownWestern Sulphite SFI Window (1 1/8 x 4 3/4, 3/4L - 1/2B)