Whether you're looking to complement your letterhead with matching envelopes, personalize invoices and mailings or coordinate your communications, PMS 1-color custom-printed envelopes are the perfect way to bring your brand to every piece of mail. These stationery envelopes can be customized with 1 of more than 1,800 color options using the most precise color matching system for unmatched quality. PMS color matching system. Select from over 1,800 colors. Configure and make the envelopes your own. 24-lb paper.