Chiikawa and MONOgraph's collaboration stationery [Features] Mechanical pencil equipped with a rotary hollow-out "MONO eraser" Sharp lead: HB, Lead diameter: 0.02 inches (0.5 mm) Size: 0.4 inches (10 mm) x 5.8 inches (147 mm) x Materials: Body: PMMA / PC / SUS; Eraser: Synthetic rubber