Possessive Pronouns are used to indicate ownership. They can be used without a Noun.

EXAMPLE: Take all those that are yours and don't touch anything that are mine.
(Pronouns 'yours' and 'mine' are used without Nouns.)

EXAMPLE: Don't borrow the books that are hers; read those that are ours.
(Pronouns 'hers' and 'ours' are used without Nouns.)