The "WH" type is nonmagnetic . Material quality of this company product ceramics is "Zirconia".
"Zirconia" Is also called as “the Soviet diamond”
The Zirconia is extremely rare in natural, but the present by the artificial method synthesis, widely serves as frequently the(diamond) substitute commodity.
Zirconia characteristic; toughness is strong. the Wearability .Degree of hardness is high. is same with the diamond degree of hardness.