Representatives of the Spring and Autumn and Warring States Period

The representative artifacts of the Spring and Autumn and Warring States periods are bronze, because at that time the productivity has not yet developed to the stage of the emergence of iron, so it is all bronze, this is for example Zeng Houyi Tomb inside the bronze chimes, this is all part of the very famous bronze, and other things, such as some of the bamboo slips and so on, there are, it depends on what era?