This is the **"Kurutoga Roulette Model"** mechanical pencil from Mitsubishi Pencil. Features: It is equipped with the "Kurutoga Engine," which rotates the lead every time you write, keeping it constantly sharp and fine. Grip: The aluminum roulette (knurling) processing is applied to the grip to prevent your fingertips from slipping. Design: The low center of gravity design and metal clip provide both stable writing comfort and a sense of luxury. Lead Diameter: Many models use a 0.5mm lead diameter.