【Fit】GEAR Shaft fis6165 ["Slim"] [] 5 (31.0mm) Clear 's Japan Review

It may depend on the weight of the set, but some lengths are more prone to breakage than others.
On the other hand, there are some lengths that have never broken.
The set-up is easy, and even when grouping is good, it is difficult for flights to come off, and there are many lengths to choose from.

The only negative point is that it is a bit expensive for a plastic shaft.

This shaft is very good because there are many different lengths to choose from and you can throw it at a length that suits you.
The flights are easy to install, so I highly recommend it!