ʻO Tungsten, molybdenum, tantalum a me niobium nā mea pono no ka mokulele a me nā ʻoihana pale ma muli o ko lākou mau waiwai: ke kūpaʻa kiʻekiʻe o ka wela, ka nui a me ka ikaika tensile, kā lākou mea machinability maikaʻi loa, a me ka pale radiation.