All of our rackets are strung by Yonex certified professional stringer Mr. Norman Lam. Lam has also been serving as a Yonex Authorized Dealer since 1993. With over 25 years of stringing experience, Mr. Lam has been providing ongoing professional stringing services for some international players and for three San Francisco Bay Area badminton clubs as their Head Stringer. He has strung over 60,000 rackets with tension up to 30lbs. His exquisite craftsmanship has satisfied hundreds of professional and amateur badminton players everywhere.