Mixed tri-oxides of Lanthanum, Zirconium and Yttrium with total rare earth composition around 1.5% - 1.8%; Tungsten remains. Non-radioactive Tungsten electrodes; excellent substitute for Thoriated Tungsten electrodes. Wide current range and low burn-off rate. Easy arc starts and good stability. [Please Note:] The color of the rods ends may be have difference and same like it was wrong color, but the materials of the rods is really the right one, just try to use them, if it not works, full refund and free returnless with no ship back guaranteed.