Specifications: Oil-based ballpoint pen refills with a long writing distance. Please check for compatible products. ◆ Product Size: Maximum Diameter 0.1 x Total Length 2.4 inches (67.0 mm); Ink Color: Black; Ink: Oil-based dye; Packaged in pack; Compatible products: Fortier 500, SL-F1 mini, Notebook, Sharbo X TS10