【Fit】GEAR Shaft fis6154 ["Normal"] ["Spin"] 4 (28.5mm) Clear 's Japan Review

An improved version of the Fit shaft, the Fit shaft gear.
CosmoDarts claims that it is "very strong" but it breaks quite easily.
It is not a cheap shaft, so if it breaks, it will damage your wallet quite a bit.
The lengths range from #1 to #8, normal, slim, and medium thicknesses, and spin and lock flight retention types.
The fact that there are so many choices puts it far ahead of other shafts.
The small number of component parts means that even if you use the spin type, it does not shake catastrophically and you will not be stressed.

There are many variations in length, so there ◎.
However, the strength is weak.
The barrel side has never broken, but the connection part of the flight side often breaks.
So the flights are sometimes useless.
I think it is a great shaft if the strength is improved.