These high-quality 0.5mm mechanical pencil lead refills are designed for use with the rOtring 600. Engineered for precision, these refills provide consistent line width and smooth, uninterrupted writing and drawing. The durable lead formulation minimizes breakage, ensuring clean and accurate results. Ideal for detailed technical drawings, precise ruler work, and everyday writing, these refills maintain the high standards of performance expected from rOtring products.