Main Comp.W over 99.98% Other Content (less than) Fe 0.0026 Al 0.0006 Si 0.001 Ca 0.001 Ni 0.0009 O 0.0018 Cu 0.0005 N 0.0015 P 0.0001 Sn 0.0001 Sb 0.001 As 0.001 C 0.0001 Mg 0.0006 C 0.002 Bi 0.0001 Mo 0.003 - -. Dia. :17.5mm Length :(720-750)mm Net weight: 3kg/piece Package: wooden case.