Aerotech and UST both have graphite putter shafts coming out. We don’t have them yet, but will (Aerotech’s by the end of the month, hopefully). Aerotech’s come in .370 and .355. UST’s All In putter shafts will be one all graphite, one graphite with a steel tip and one that you can customize with a double bend or a taper tip by cutting the double bend off a steel shaft and attaching to the graphite shaft, much like other products you have seen on the market. UST’s are .370. KBS was suppose to have one too, but not sure it is coming or not. You can use an iron shaft for a straight putter shaft, no problem. Since putter heads are heavier, using a stiffer shaft at the weight you want would most likely be the way to go.