The Apple CEO presented the president with a “unique” piece of glass held by 24-karat gold during a celebratory event Wednesday in the Oval Office.

Some of Apple’s most valuable parts, such as its glass and facial recognition sensor, are made by U.S. companies that Apple has worked with for years.

Apple CEO Tim Cook will join President Donald Trump at the White House Wednesday afternoon to announce a new $100 billion pledge to invest in the United States, according to a report from CNBC. Dubbed the “American Manufacturing Program,