de of.

of; ~'s (possessive particle); (used after an attribute when it modifies a noun); (used at the end of a declarative sentence for emphasis); (used after a noun, verb or adjective to form a nominal expression, as in 皮革的 "one made of leather" or 跑堂兒的 "a waiter (literally, one who runs back and forth in a restaurant)" or 新的 "new one")