Characteristic: strong current carrying and super conducting, thorium-free, green, healthy and non-pollution. Advantage: By matching different rare earth elements in scientific ratio, such as lanthanum, cerium and yttrium; lanthanum, zirconium and yttrium; lanthanum, zirconium and rhenium, the products get gathering function and excellent performance and are more durable. Thorium-free Non-radiative Strong current carrying Super conducting More durable