A wise man's guess would be Stiff Regular flex, between Stiff flex and Regular flex.
The different Letters on a golf shaft are the flex of the club. In order from stiff to soft: X - EXtra Stiff S - Stiff R - Regular A or M - Senior (Amateur or Mature) L - Ladies. The letters may be combined to show in-between ratings, such as SR (Stiff/Regular).
Something labeled senior flex will probably be more flexible than regular. There is no real standardization among shaft makers, but typically they are ordered (from most to least flexible) L - Ladies A - Senior R - Regular S - Stiff X - eXtra stiff The rule of thumb is that slower swingers do better with more flexible shafts, because if timed right the flex can add some power and height to the shot. The "A" designation between Ladies and Regular flex doesn't stand for anything in particular. They couldn't use "S" for the Senior flex because it was already being used as the designation for "Stiff" flex. The abbreviation for Senior, "Sr.", could also be confused with a "Regular/Stiff" flex. So in an attempt to avoid confusion (or possibly add a little), the letter "A" was decided upon as the designation for the Senior flex shaft.
what does sr stand for on morphine sulphate
dennis peete
it means super jecetion
Strategic Reconnaissance
Synthetic Resin
steady riding
SR indicates Shire Reckoning and refers to the system of tracking years.
Sr stands for strontium on the periodic table of elements.
Safety restraint