Looking for a #10 single window imprinted envelope, this single window envelope has a gummed flap that seals securely when moistened and would have your company information printed on the envelope. Add your logo at no additional cost! This single window imprinted envelope is the perfect choice. Envelope size is 9 1/2 x 4 1/8 Window size 4 1/2 x 1 1/8 Window placement 7/8 from left & 1/2 inch from the bottom.