PLEASE NOTE : All SR shafts we sell are rated as Stiff/Regular flex, not Senior flex. Stiff/Regular flex is between Stiff and Regular! Thank you for visiting Golf Partner. Golf Partner is the NO. 1 secondhand golf club retailer in Japan, seizing over 50% of the market share.We are also a listed company in Japan since 1999. We have 300+ domestic stores, and we provide clubs at reasonable prices. Please send us a message at any time if you are interested! ¦GOLF Partner is a domestic retail store.