Txhawm rau kom muaj txiaj ntsig zoo, peb nruj tswj hwm kev tswj hwm zoo, los ntawm cov khoom siv raw, tsim, thev naus laus zis, kev tsim khoom rau tag nrho cov txheej txheem ntawm kev tshawb nrhiav.
Cov khoom siv raw:
Peb cov pa roj carbon steel thiab cov hlau tshwj xeeb yog muab los ntawm cov tuam txhab loj thoob plaws Suav teb.