Made of a totally castable material for the stable retention of modelling materials, resins or waxes by means of two flat surfaces that stabilize the lightening and loosening movements during production of the structure or during clinical use.The millimetre grooves allow for the vertical embedding of wax or plastic material, withstanding compressive and traction stress during the production or during clinical use.The footing area precisely delimits structure preparation. A perfect joint with normal plastic materials.Made of sanitary polyoxymethylene, the same material used to make permanent clinical components, it is totally castable and allows for high-quality machining to ensure suitable shapes and sizes.