BALL - Key Persons

Peb mob siab tsis tu ncua nws tus kheej los tshawb nrhiav thiab tsim cov txheej txheem sib tsoo ntawm cov pob steel thiab feem ntau tsim cov khoom steel xws li chrome steel npas (aisi52100), carbon steel npas (aisi1015) stainless hlau npas (aisi304.316.420.440c).