EGP Self Seal Single Window Security Lined - 9 1/2 x 4 1/8 Security-lined for confidentiality Return Address Imprint is Free Envelope Size 9 1/2 x 4 1/8 Window is 4 7/16 x 1 and is 7/8 from left and 1/2 from bottom Pricing is for 500 envelopes