According to Callaway Golf Preowned when I bought mine, Callaway Rifle Uniflex is somewhere between 5.5 and 5.0. This was back in 05, not sure what the answer would be now. According to Rife, 5.5 is stiff, 5.0 is R+, 4.5 is regular. I wanted 4.5's in this set of Alpha's, but all I could get was 5.0's. I soft stepped them once, not enough to get them down to 4.5's, but to play a little softer than std 5.0's. They are 100% perfect for me, and they also feel softer than the Uniflex shafts did. Similar but I get more overall distance with no control problems ( unless the problem is my swing

).