The free model is an almost exact copy of the cast part to be produced and is a cheap, simple and widely used model type. When dimensioning free models, shrinkage and machining allowances are taken into account. The core heads, which form the slots of the cores to be placed during molding, are also found on the model. They are usually made of wood, but metal, plastic, plaster, wax or other suitable materials can also be used. Molding in freestyle models is mostly done by hand, so the method is slow and expensive. During molding, the model is divided into two parts so that the model can be stripped from the sand, and the upper and lower parts are interlaced. The positions relative to each other with the pins, the junction surface of these two parts determined, is also the section surface of the mold. In sand molds, runners, risers and other cavities, which are generally opened manually, can also be considered together with the model or as separate model parts if desired.