It is strong, long and can be written. The perfect amount of "straight liquid type" and "filling type". Line Width: 0.1 inches (3.0 mm); Length: 4.9 inches (124 mm); Material: Recycled Material; Refillable Cartridges: R-WBKC; Direct Liquid Type; Eco Mark Certified Product; Green Purchasing Law Compliant Product; Product listed in the Green Purchase Network (GPN)