With this method, metal is poured into a mold of damp sand. The sand is packed very tightly around this model. The model is then removed and the sand is baked until it becomes as hard as rock. The mold is often made in small sections that are joined together. These mold marks must be removed through cold-working (essentially finishing touches that are applied to the hard, cooled cast bronze sculpture). Cold-working tools include files, chisels, hammers, and abrasives. These are used to remove imperfections and to restore details that did not surviving casting. Other elements not a part of the original mode may also be added at this point.