Types of pen points

18K
It has very high acid resistance and can withstand years of use without rusting or corroding even with acidic ink.
Flexibility is high in comparison to the ones with same nib shape.

14K
It has very high acid resistance and can withstand years of use without rusting or corroding even with acidic ink.
It has an appropriate flexibility that is optimal for the strong and weak brushstroke of Japanese characters.

Stainless steel (SUS316)
It has high acid resistance and can withstand years of use without rusting or corroding even with acid ink.
The pen's elasticity has increased, but its flexibility has reduced. The price of the material is minimised, which makes it more affordable for all users.