specification:

Derma roller yog cov cuab yeej zoo nkauj uas tuaj yeem siv tau tab sis tsis txwv rau cov hauv qab no:
1. Kev tu tawv nqaij: Derma rollers tuaj yeem txhawb cov tawv nqaij rov tsim dua tshiab, ua kom cov txheej txheem ntawm collagen thiab elastic fibers, txhim kho daim tawv nqaij zoo nkauj thiab elasticity, thiab txo cov tsos ntawm cov kab zoo thiab wrinkles.
2. Kev kho pob txuv caws pliav: Derma rollers tuaj yeem txhawb cov ntshav ncig hauv thaj tsam pob txuv, txhawb kev loj hlob ntawm daim tawv nqaij tshiab, thiab txo cov tsos ntawm nti.
3. Cov plaub hau rov tsim dua tshiab: Derma rollers tuaj yeem txhawb cov ntshav ncig ntawm tawv taub hau, txhawb kev noj zaub mov ntawm cov hauv paus plaub hau, thiab txhawb kev tsim cov plaub hau.
4. Txo cov pigmentation: Derma rollers tuaj yeem ua kom cov ntshav ncig hauv thaj chaw pigmented, txhawb kev loj hlob ntawm daim tawv nqaij tshiab, thiab txo cov tsos ntawm pigmentation.
5. Txhawb nqa cov khoom haum: Derma rollers tuaj yeem tsim cov kab me me ntawm daim tawv nqaij, ua kom cov khoom nkag mus, thiab txhim kho qhov nqus ntawm cov khoom tu tawv nqaij.