An ox goad has an exterior and an interior, from seven [handbreadths] for the blade, [and] from four [handbreadths] for the prod; [these are] the words of R’ Yehudah. R’ Meir says: They do not have [an exterior and an interior]; [the measures of] four [handbreadths] and seven [handbreadths] were mentioned only with regard to remnants [of ox goads].

Measuring instruments used for wine and oil, and a zomalystera, and a mustard strainer, and a wine strainer, have an exterior and an interior; [these are] the words of R’ Meir. R’ Yehudah says: They do not have [an exterior and an interior]. R’ Shimon says: They do have [an exterior and an interior], [in that if] they were rendered tamei through their exterior, their contents [remain] tahor, but one must immerse [the entire utensil].