Technical pen with refillable ink reservoir. Stainless steel points. For drawing onto tracing paper, vellum drawing paper and lineboard. Push-on sleeve for easy access to ink helix.
Technical pen using cartridge system. Cartridge includes pressure-equalisation system & ink helix. New ink helix with each cartridge - no need to clean ink helix. For drafting and drawing onto paper, tracing paper, vellum and line board