DESCRIPTION: This fine ballpoint pen uses a twist-action mechanism, which is the most direct way to use a pen. It is simple and durable. You can enjoy this pen during your travel or daily use. SPECIFICATIONS: Material: Brass, Copper Specifications: 8 X 9 X 123 mm Refill: Cross-type ballpoint pen refill USE AND CARE: The color of brass can be altered by different users and various environments, but this is also its unique characteristic. 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 marks through the owner's constant use. Please try and enjoy this unique beauty of brass.