Herbin, 5 kg modeling clay, hardness grade 70. The modeling material retains its strength and leaves no residue when drying. The casting material does not deform after the model is created, as it possesses excellent stability. The modeling clay does not dry out in the air, allowing you to work on and modify your model as often as you like. For example, it can be softened with your hands, a heat gun, or a hairdryer, and it hardens again when cooled in the refrigerator. Packaging: tube, lined inside with sulfurized paper and 2 end caps made of polypropylene. Modeling clay is a very precise modeling paste with high stability that never dries out in the air, which offers the advantage of being able to be worked on and changed as often as necessary. It is also used in industry (automotive, aerospace) for creating prototypes or molds. Artists also use modeling clay, for example, for reproducing models. The precision of reproduction is accurate to within 1/10 mm.