Based on this product's specifications, here are some alternatives and similar models
Technical Drafting Pen Rystor 0.50 mm Black - precision line drawing instrument
Summary description:
Rystor technical drafting pen with a 0.50 mm tip in black ink, designed for precise line drawing and technical illustrations. Suitable for architectural and engineering sketches, technical diagrams, CAD overlays, and detailed artwork. Provides a consistent medium-thickness line for drafting, labeling, and schematic work where controlled ink flow and accuracy are required.