Quality 24 lb white pictorial, side seam envelopes with an inside tint for security and two windows. One window is for mailing address and the other for return address. Both windows are 1 1/8" x 3 1/2", placed 3/8" from the left edge. The top window is 2 7/16" and the bottom window is 9/16" from the bottom edge of the envelope. 500 per box.  #9. Size: 3 7/8" x 8 7/8".