Which [damaged utensil] is a gistera? Any [utensil] whose handles have been removed. [If] it had protrusions jutting out: Any [protrusion] that can contain olives transmits tumah via contact, and opposite [that area] transmits tumah via airspace; any [protrusion] that cannot contain olives transmits tumah via contact, but opposite [that area] does not transmit tumah via airspace. [If] it was resting on its side, like a katedra: Any [protrusion] that can contain olives transmits tumah via contact, and opposite [that area] transmits tumah via airspace; any [protrusion] that cannot contain olives transmits tumah via contact, but opposite [that area] does not transmit tumah via airspace. The bottoms of Kurfian [utensils] and the bottoms of Sidonian cups — even though they cannot stand without support — are tamei, since this is how they were initially made.