sdandrea1 No clue, no guess.
2 things I've found in using them....
Driver shafts- color makes a diff..... yes, believe it or not. White or Neon are the best 2. The best was the black/silver which they no longer carry, for some strange reason. I say this about the colors even though the stated weights are very accurate in the 67-68g. range; never had any outside that. Maybe a rare 69g. 1 time.
Iron shafts did not perform (for me) as I wanted. Seem to be too stiff (tip) per flex, even at A. Never dropped to L, so no clue how that plays.
Great shafts though, after all these years, and still basically the same $10. Gotta like the weight though, to want them.😉
