“Sharable goods are those that have at least some excess capacity” (Blenkler 2004). They can be used by more than one person (In this case information captured by pen can be utilized by more than one person) either at the same time or consecutively. He proposes that the most shareable goods are those that are in principle “lumpy” and “midgrained”.
Lumpy: He means that their purpose comes in distinct packages of creating limp (slack).
This pen could be consider lumpy because the physical condition of the pen is limited to one person at a time.