The Platinum Souhitsu Double Sided brush pen has a black and a gray tip.
The Platinum Souhitsu line of brush pens feature a tip that is softer at the tip and firmer towards the back.
This special design gives the user a better control. There is more ink flow at the tip than further back, making it write like a real brush. It uses carbon pigment ink that is waterproof.
The Platinum Souhitsu brush pen is co-developed by famous Japanese calligrapher Souun Takeda.