Only Sharpie could reinvent the pen with a pencil. Their new “Liquid Pencil” writes as smooth as a pen, but is fully erasable like a pencil for up to 3 days.Then somehow, by way of magic and fairies, the ink (made from liquid graphite) turns permanent like a marker after 72 hours. This combination pen, pencil and marker is pretty amazing and will no doubt turn on any Sharpie fanatic.