Top left Medieval styli. Made of bone with metal tips, of the type probably used for scoring the ruling patterns in manuscripts until the twelfth century
Below A stick of lead or plummet, suitable for ruling lines in Gothic manuscripts. His English example, marked with the name of its owner Rogerus, may have been cast in the thirteenth century
Top right A page of a fifteenth-century French Book of Hours ruled up in ink in preparation for writing

After Christopher De Hamel, Medieval Craftsmen. Scribes and Illuminators (London: British Museum Press, 1992),  pics. 15-17, p. 23.