Lead for writing, drawing and colouring devices has colour-producing core and outer casing, whereby casing encloses core viewed in cross-section of lead and casing and core are movable in relation to one another

摘要

The lead (1) for writing, drawing and colouring devices has a colour-producing core and an outer casing, whereby the casing encloses the core viewed in cross-section of the lead and the casing and core are movable in relation to one another. The casing (2) has a higher bending strength than the core (3). The casing is located concentrically to the core. The casing has a different colour to the core.