Specifications: The smoothest point pen in the world. Ultra-low friction, low writing resistance, slouchy writing. Material: Shaft: Elastomer + ABS resin; Mouth Pla: ABS resin; Ink Color: Black; Body Size: Shaft Diameter 0.4 x Total Length 5.6 inches (11.3 x 141.5 mm); Body Weight: 0.4 oz (11.5 g); Ball Diameter: 0.03 inches (0.7 mm); Mechanism: Knock-type; Refill: SXR-7