Main Comp. 99.999 Impurities max. K 0.000005 Na 0.00005 Ca 0.00005 Fe 0.0001 Ta0.0001 Pb 0.00001 Cu 0.000007 Sn 0.000005 Ba0.00001 Mn 0.000005 Be 0.000005 Pt 0.00003 Co0.000005 Cd 0.000005 Cr 0.000005 Mo 0.00001 Mg0.00005 Zn 0.00005 Sb 0.00005 Al 0.00005 Ni0.00001 Ti 0.000005 Bi 0.00001 As 0.00005. Purity: WY99.999% Appearance: Grey metal bar Density: 18.2 g/cm3.