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I recently broke the shaft on my Innovex 5I, and apparently FST has discontinued the FST Pro White line. Can any fitters recommend a similarly performing replacement shaft?

Why not contact Innovex and ask them what they recommend, they might just replace it for free since you got them from them. Worth asking at least. They should know what shaft will work as a replacement if they don't have the FST on hand. Innovex is the only company I know that uses the FST line of steel shafts.

Let's just say that it didn't break during normal use...
Luckily, I was able to find a reputable Ebay seller with some of these shafts available. Thanks for the suggestion, though.

For future reference, these Flaming Copper Shafts are Pro Whites (label on the butt says so)

Flaming Copper Series | Steel TechnologyFlaming Copper Series | Steel Technology

The price is pretty low, at $4.00 a shaft. I wonder how good the shaft is at that low a price, Is the ProWhite shaft a decent shaft? Anyone now?

I can't speak to the Flaming Copper shafts, but I've been pretty happy with the Pro Whites. I get a nice trajectory when I put a good swing on it., and they have a good smooth feel to them.
From what I understand, FST supplies a lot of shafts to the OEMs for rebranding, and the Pro series is just their own brand. Now they have Kim Braly from Royal Precision designing for them, and they've been revamping their entire product line, including the new KBS series.

The current version of the "Flaming Copper" shafts are not a good replacement for FST Pro White shafts. I bought a set, of Flaming Copper shafts and the weights were all over the place, some were 6 to 7 grams off. And, they didn't feel right when I hit them. I had two of them bend at the tip in a set of R7's so, I had to pull them. I replaced Them with Pin Hawk shafts from Value Golf, they are in fact Pro Whites. The weights were all within 2 grams of the 122 gram specs. and they play like the Pro Whites I remember. When I complained to Proseries golf about the Flaming Copper shafts, they ignored me. That's to bad because I was a regular customer.

I have a set of Innovex irons with FST Pro White shafts, and I don;t know if it's the shafts, or the heads, but I like my Dynamic Gold shaft irons a lot more, Just don't like the feel of the Innovex irons for some reason. I like the look of the heads, so I guess I could just pull one of the shafts, and install a Dynamic Gold shaft and see if it's the head or the FST shafts I don't like.