The Tombow Mono Mark Sheet Pencil is made of the highest quality, highest integrity, hardest-to-break HB Graphite Lead. It is made especially for Japanese students sitting multiple choice exams and so the lead is made to deal with all the stresses of indecision and frantic checking! Even though they are not necessarily made for general writing, they are more than capable of the task. Indeed, they're simply marvellous at it.
Tombow Pencils are professional tools made in Japan since 1913. Used by artists, engineers, cartographers and all manner of people who need to use the highest quality in their work.