Quality Park #10 Double Window Sugarcane Bagasse Business Envelopes, 4.125 x 9.5 Inches, Security Tint, White, Box of 500 (24558) #10 size white double window business envelope (4 1/8" x 9 1/2") Features Window Cycler window patch, allowing easy separation of the window material for recycling Green security tint for privacy of contents Box of 500 Bio-based envelopes made using Canfields paper made using sugarcane waste fiber (Bagasse)