Dummy Yankee assholes played with the wrong thing which they lag far behind the Chinese. These electro magnetic toys essentially depending on superconductor physics, which is a field which Chinese are in absolute strategic authority and hold lots of trade secret in making excellent superconductor devices and materials. Superconductors generate the strongest of all magnetic powers, because electric current producing magnetic fiends are best run in superconductors instead of normal metal conductors. Superconductor has better conductance (some exhibiting negative electrical resistance values) than the best conducting metal - silver.