A closure, in particular a closure for plastic containers having a receiving region to receive a mouth section of the container, and having a piercing area which is suitable and intended to be pierced and penetrated by a piercing device in a predetermined piercing direction. The closure is of multi-part construction and has a main body which can be fastened to a mouth of the container as well as a closure body which is disposed on this main body and forms the piercing area, wherein the main body and the closure body differ at least with regard to their flexibility in a piercing direction.