- Creative adaptability: Schultifacetated replacement parts meet complex creative requirements by allowing variations in line thickness within the same project. This is a cost-effective solution for moving between light drafts and directed strokes without changing tools. - Precision with constant writing: The flexible core design delivers smooth, reliable writing, improves resistance to lead breakage, maintains consistent performance, and extends usage per refill for mechanical pens. - Ideal solution: A balanced combination of sustained smoothness and controlled release, optimized for both creative and technical activities that require accuracy without fatigue. - Responsible design: From raw material selection to final packaging, every production stage follows environmental sustainability criteria to ensure safe products for children and compatibility with environmentally friendly lifestyles. - Use scenarios: - Artists and designers working on concept sketches that evolve from light drafting to strong, marked lines without switching parts. - Engineers and technical drafters who need precise lines and controlled stroke weight during drawings. - Students and professionals who take notes, alternating between light annotations and darker emphasis for emphasis or highlights.