DESCRIPTION: This rollerball pen stands out for its exquisite materials, but even more so for its functionality. It's heavy enough to provide a stable grip and smooth writing. You can enjoy this pen whether you're taking notes or signing. SPECIFICATIONS: Material: Brass, Copper. Specifications: 9.7 x 11 x 130 mm. Refills: e.g., SCHMIDT Safety Ceramic Roller 5888 F. USE AND CARE: The color of brass can change with different users and various environments, but this is also its unique characteristic. The oxide is harmless. It would restore its original shine by cleaning with Brass Polish. Without any surface treatment, we hope that each product can maintain its individual characteristics through constant use. Please try and enjoy the unique beauty of brass.