Slate pencils are writing tools traditionally made from a mixture of graphite and clay. They are designed for use on slate boards, which are smooth, dark surfaces that can be easily wiped clean. Slate pencils produce a fine line and can be sharpened to a point, making them ideal for writing and drawing. These pencils were commonly used in schools before the widespread adoption of paper and ink. They allowed students to practice their writing skills and perform calculations without wasting materials. Today, slate pencils are less common but can still be found in some educational settings and art supplies.