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Keystron Memory Solutions provides full lines of compatible memory upgrades for HP LaserJet and LaserJet Pro series. The products are manufactured in our facility in Lexington, South Carolina. All memory modules are fully tested on both professional memory testing equipment and the actual printer before they are shipped to our customers. We offer a lifetime replacement warranty for our printer memory products and free return shipping for warranty claims. Keystron, LLC has been manufacturing memory modules in South Carolina, United States since 2006.