Various other objects and weapons made of copper have been discovered at Nippur, Fâra, Tell Sifr, and other Babylonian sites, and they include hammers, knives, daggers, hatchets, fetters, mirrors, fish-hooks, net-weights, spear-heads, vases, dishes and caldrons, the weapons sometimes having rivets for wooden handles, which have long since perished.[110] The moulds in which all these copper objects, both hollow and solid, were cast were probably made of clay, though in later times stone was frequently used as a material for making moulds for metal-casting, and various examples of such moulds made of steatite, wherein were cast ear-rings and other articles of jewellery, are now in the British Museum, while at the same late period bronze itself seems to have been employed, and bronze moulds for arrow-heads are still extant. But there is no evidence for the use of either stone or metal moulds among the Sumerians, and it is to their use of clay moulds that we must doubtless ascribe, at least in part, the extraordinary animation which these early Babylonian figures exhibit, for obviously the fashioning of the head of a bull or of a human being in clay would be a comparatively easy work to chiselling it in stone, and the work would consequently lack the heavy laboriousness which is so often the outstanding characteristic of early stone sculptures. The copper remains of this age are far from being as ample as one might wish, but many weapons, tools and other objects which must undoubtedly have been made of metal, and therefore probably of copper at this time, are portrayed on some of the earliest Babylonian reliefs and seals, and give us some idea of the extensive use which the Babylonians of this remote period must have made of metal, and of the numerous purposes for which they employed it. Sometimes it would appear that instead of fashioning the required objects by means of moulds, they relied entirely on the hammer: evidence of this was forthcoming by the discovery of a portion of the horn of an ox by De Sarzec at Tellô. Unfortunately no other part of the animal to which this horn belonged was brought to light, but the horn is life-size and well made. The core consisted of wood upon which the copper plates were fixed by means of small nails.