Check their website, and I think you'll find everything you're looking for. I was interested a couple years ago when I got my AP2's and was debating shafts. I was trying to match what I had in another brand prior and was doing good with. I ended up with the in-between shafts. I got the weight I wanted, but now you can get shafts from many and KBS is one where regular + or stiff + are more than regular or stiff, but less than extra stiff. Like Project X was with 5.5 6.0 6.5 etc. I'd still see a Titleist fitter who'll help you more than you could imagine.