Lus piav qhia luv luv:

1. Sab hauv phab ntsa txheej, sab hauv phab ntsa ntawm lub tank yog ua los ntawm cov khoom siv roj ntsha / cov roj kub, uas yog qhuav thiab huv, tsis yooj yim rau xeb thiab nyab xeeb.

2. Sau cov zaub, sab hauv cov ntawv ci yooj yim tau sib khi tau, sab nraud ntsuas phoo sholesing txheej txheem, muab cov sib faib ob npaug muaj kev nyab xeeb

3. Ntau hom kev luam ntawv, cov xim ci, xim me me sib txawv, cov txheej txheem ntau lawm, kev luam ntawv ntshiab, thiab embossed printing, engraving cov txheej txheem, thiab lwm yam.

4. Lub cev tuaj yeem yog dov thiab ribbed, ribbed tsim yog muaj zog thiab tsis-deformable, craftsmanship yog meticulous, nto yog du thiab nws yog xim hlau, gloss yog zoo, tsis muaj burrs thiab nws xis nyob rau ntawm tes.