VSR Pro 8™ Motor Magnets are a high strength compression molded polymer magnet. The Pro 8™ tyco motor magnets are the strongest polymer motor magnet available for the Tyco 440X2. Great magnets for high power armatures and big horsepower. All magnet batches are precisely controlled and consistent. mind. These magnets are typically used for Polymer modified racing and VSR recommends using performance armature and aftermarket track power supply for best results Great stock performance upgrade.