Tools and implements for daily use such as stone axes and chisels, bone needles and points, and small balls (possibly used for hunting birds, as well as for games) remained virtually unchanged from very early times. In addition to worked stone and bone, copper began to be used for tools and weapons such as spearheads and axes in the period preceding the rise of the Indus Civilization. The development of this more sophisticated metal technology may have played an important role in the formation of the Indus Civilization.