Specifications: Vivid and smooth writing. Ink Color: Black; Product Size: Shaft Diameter 0.09 x Total Length 2.6 inches (2.4 x 67.2 mm); Product Weight: 0.04 oz (1.0 g); Ball Diameter: 0.02 inches (0.4 mm); Ink: Water-based pigment; Body: Sharbo X TS10/CB8/CL5/AL5/LT3/ST3, New Spiral 2+S.