The Contractor shall: 1. Print and deliver Custom White Printed Envelopes with Indicia by the dates in Section G. Delivery Schedule unless otherwise specified in writing by the SCO Representative in Section I. Contacts. 2. Proofs: a. Provide one envelope proof in portable document format (PDF) and color stock sample for review and written approval per Section G. Shipping and Delivery Instructions. b. SCO will review the proof and respond in writing within three (3) business days of receipt. c. Contractor will respond within two (2) business days after receipt of SCO written request for corrections or design modifications. 1) Provide up two (2) design modifications when requested in writing by SCO. 2) Modification design requests shall not increase the overall envelope dimensions or change the materials used in product construction. 3) The final design that incorporates all requested modifications, if requested, shall be approved in writing by the SCO Contract Manager prior to production.