Bio-based, double-window, No. 9 envelopes feature Canefields paper made using sugarcane waste fiber (Bagasse), an eco-friendly, sustainable, renewable resource. The WindowCycler window patch allows easy separation of the window material for recycling. Inside tint pattern protects your privacy and contents. Top window measures 15/16" x 3-1/16" and is positioned 15/16" from left and 2-1/2" from the bottom. Bottom window measures 1-1/8" x 4" and is positioned 1" from left and 13/16" from the bottom. Sugarcane paper envelopes also feature a regular gum closure to seal the envelope securely.