Hi unfortunately the labels were removed, they are brushed steel and were advertised as KBS C taper lite Stiff flex. I'm guessing the stickers started to look worn and were taken off, after hitting the club's I would certainly say they are stiff rather than regular flex. The seller informed me that they were actually custom fit for a golfer with a 100mpg swing. I guess I'm still in the dark but I'm pleased with how they perform regardless, I was hoping that perhaps you could add a weight and measure shaft deflection which would indicate flex??
Thanks for the reply