Innovative technology, comfortable grip, and quality design ensure Tombow Mechanical Pencils stand out from the crowd. Each pencil features refillable 0.5mm graphite lead, a replaceable MONO Eraser, our signature shake-to-extend mechanism, and a fixed guidInnovative technology, comfortable grip, and quality design ensure Tombow Mechanical Pencils stand out from the crowd. Each pencil features refillable 0.5mm graphite lead, a replaceable MONO Eraser, our signature shake-to-extend mechanism, and a fixed guide pipe to prevent lead breakage. e pipe to prevent lead breakage.