【Fit】["Carbon"] fis6731 ["Normal"] [] 1 (13.0mm) White 's Japan Review

I bought two sets after reading reviews that said they would last a year, but seven of them broke in less than a week.
I had an image that the fitted shafts would break when dropped, but they never broke when dropped.
However, when the shafts were inserted into the target, the vibration caused the part of the shaft that was covered by the flight to break cleanly and the flight to fall to the bottom.
I was surprised because I had never had such an experience before.

I use #4.

I purchased it in 06/2014 and have been using it for over a year.
Prior to purchasing this item I was using a plastic shaft.
I was afraid that it would break every time I dropped it on the floor because the floor of the home store is hard wood and the board would flip it.
In fact, it often broke. On many days, I broke three boards in one day.

After switching to this product, I no longer have that kind of stress and I am very satisfied.
I think the cost performance is good.
Considering the amount of time and money I have to spend buying plastic shafts every time they break, I think I can get my money's worth in a few months.