Cov tsoos lub teeb ncej yog yooj yim rau xeb, dab tsi yog ntau, tus tsim tsis muaj ntau haiv neeg, nto yog heev ntxhib, pwm nqi yog siab, thiab ib puag ncig-tiv thaiv yog muaj tseeb phem, thiab lwm yam.
MJ cov khoom siv patent tshiab style tshwj xeeb zoo steel aluminium ncej ntse daws tau cov teeb meem saum toj no, kev tsim qauv zoo nkauj thiab niaj hnub ua rau lub teeb ncej zoo nkauj.