A set of precious material items that be can be used to upgrade weapons, armor, and accessories. Contains the following items:

U-Material x20
U-Material+ x10

※The above items can also be obtained in-game.
※After purchase, items can be obtained in-game by selecting ITEM from the main menu, and then selecting newly added content within the DLC tab.
※If the carrying capacity for an item has been reached, additional items will be discarded.
※The main game Trails in the Sky 1st Chapter is necessary to use this content. In the event the latest patch is necessary, please update the game first and then make use of the content.

More details on the official game page of U-Material Set 4 ...