Yakushima hardness

Strong. It grows slowly, has tight annual rings, is rich in resin, is hard, and is not easy to corrupt. Yakushima is a kind of fir tree, which naturally grows on the mountain above 500 meters above sea level. To put it simply, it is a fir tree that grows in Yakushima 1000 years or more, and a fir tree that grows below 1000 years is called a small fir tree.