to provide focusing of the generated sh waves in a test material component the array of magnets may have variation in the distance between adjacent magnetic poles that is a function of the radial distance from the focal point this variation in the array of magnets causes a change in the vertical width of the sh wave in other embodiments two or more arrays of magnets may be arranged in tandem with each having a different radial distance between magnetic poles so that they will have approximately the same sh wave angle and focal point when operated within a prescribed range of frequencies in a further embodiment the array of magnets may have high frequency rf conductors embedded in grooves which lie across the magnetic pole faces and are collinear with radial projections from the focal point a flexible multiple pole magnet array may comprise an array of magnets and magnetic poles fabricated at least in part from a flexible material such as silicone rubber containing particles of ferromagnetic material such as iron or permanent magnet material such as neodymium iron boron electrical conductors may have a shape width and thickness such that they can be installed between the magnet poles and energized with an electrical current to provide alternating magnetic polarity between adjacent magnetic poles in other embodiments the electrical conductors may have a shape width and thickness such that they can be installed between the magnet poles in multiple layers connected in series and energized electrically to provide alternating magnetic polarity between adjacent poles illustrated in fig4 is a conformable flexible multiple pole magnet array 19 which may be used with other electrical components known in the art to form an emat that generates sh waves in.