Refill lead and eraser set for the Derwent Precision Mechanical Pencil. Refill sets contain 15 HB and 15 2B replacement leads for the 0.5mm pencil barrel plus three replacement erasers. Derwent Precision Mechanical Pencils have a premium full metal body, perfect for maintaining grip and balance whilst creating fine line drawings. The graphite leads have a strong point for extended use and minimal breaking. Up to five leads can be placed into the pencil barrel at one time. The smooth laydown of graphite makes the pencil perfect for fine detail and cross hatching techniques.