Herbin, 5 kg of modeling clay, hardness level 55. 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 clay does not dry out in the air, allowing you to work on and modify your model as often as you like. It can be softened with hands, a heat gun, or a hairdryer, and it hardens again when cooled in the refrigerator. Packaging: tube, lined inside with sulfur paper and two end caps made of polypropylene. This modeling clay is a very precise paste with high stability that never dries out in the air. This allows it 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 reproducing models, with reproduction precision down to 1/10 mm.