These pencil leads are compatible with the Uni Kuru Toga mechanical pencil. Uni’s Kuru Toga leads are specially-composed with a soft outer layer of graphite surrounding a hard inner core. This allows them to be sharpened into a point, a feature unique to Kuru Toga pencils. This slim, cylindrical sturdy plastic lead case in metallic blue contains 0.5 mm 2B / B / HB pencil lead.