3-7/8" x 8-7/8" ( 3.875" x 8.875" ), Regular Envelope, C Style Window, 1-1/8" x 4-1/2", 7/8 from left, 1/2 bottom, White Sulphite (SFI Certified), 92% Brightness, Vellum Finish, Black Inside Tint, Diagonal Seams, Poly Window, Remoistening Seal, Flap Down