vilbostone porcelain stoneware tiles from Villeroy & Boch are durable and hard-wearing by nature. vilbostoneplus, a surface seal, further enhances these properties for all matt porcelain stoneware tiles: during the manufacturing process, the structure of the tile surface is sealed to such an extent as to further increase the tiles' resistance to staining and dirt, as a result of which subsequent treatment of matt tiles with impregnating agents becomes unnecessary.