On April 12, 2007, the Forever stamp went on sale for 41 cents, and is good for mailing one-ounce First-Class letters anytime in the future—regardless of price changes. In 2011, the Post Office began issuing all new stamps for First-Class postage—both definitives and commemoratives—as Forever stamps: denominations were no longer included on them. Beginning in 2015, the Post Office made all other stamps Forever stamps-Postcard, Additional Ounce, Two Ounce, Three Ounce, and Non-Machinable Surcharge, and these types of stamps now have their use printed on them instead of a number.