Dual-window envelopes show mailing address and return address when used with the landscaping work order/invoice forms (Item No. 162394) or landscaping proposal forms (Item No. 162395). Convenient self-seal adhesive. Envelope measures 9"x4-1/8. Fits form size 8-1/2"x11". USA made. Specify 250, 500 or 1,000 envelopes.