TIEN-I's Q.C. staffs all have received standard training offered by SGS institution. Q.C. personnel supervises the quality in each process of production.  In 2006, we passed the ISO9001 certification as a proof of our quality complying with the international standards.

Humidity, torsion, hardness and other specific tests are included in our manufactory quality examination. Our testing results all meet or even surpass the requirements of ANSI, DIN, and ISO standards.  Therefore, the best quality is guaranteed.