1. Sab hauv / sab nraud saw deformation, kab nrib pleb, paj ntaub yaig
2. Seb tus pin yog deformed los yog tig, paj ntaub etching
3. Seb tus menyuam yuav tawg, puas tsuaj. Txav dhau kev txav
4. Poob Chaw Poob Lawm
5. Kev ua hauj lwm nrog tsis muaj suab nrov los yog kev co, lub zeem muag lubrication yog qhov zoo