Based on this product's specifications, here are some alternatives and similar models
Lead refill Rotring Polymer Leads B 0.7 mm S0312680
Summary description:
Rotring Polymer Leads in hardness B and thickness of 0.7 mm are designed for smooth writing and precise lines. Ideal for technical drawings and sketches, these leads offer excellent break resistance and consistent performance. The polymer composition ensures a clean and clear mark on paper, making them a reliable choice for artists and professionals alike.