Apple has signed a $500-million deal with Pentagon-backed MP Materials for a supply of rare earth magnets, becoming one of the first tech companies to ink a U.S. supply agreement after China curbed exports earlier this year.

MP Materials, which runs the only American rare earths mine, announced a new $500 million agreement with tech giant Apple on Tuesday to produce more of the powerful magnets used in iPhones as well as other high-tech products like electric vehicles.

The factory will develop a series of neodymium magnet manufacturing lines specifically designed for Apple products.