Series: Uni-ball one Features: Black is darker and the colors are more vibrant, making it easy to remember and write crisp letters Compatible products: UMN-S-05 (uni-ball one 0.02 inches (0.5 mm)) Lead Diameter: 0.02 inches (0.5 mm); Ink Color: Black Size: Shaft Diameter 0.2 x Thickness 0.2 x Total Length 4.4 inches (6.0 x 6.0 x 112.0 mm); Weight: 1.4 oz (42 g)