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When a current is passed through the coil, a magnetic field is generated around the coil. This additional magnetic field can generate an external force to the upper permanent magnet, or push or suck. When a current is passed through the coil, a magnetic field is generated around the coil. This additional magnetic field can generate an external force to the upper permanent magnet, or push or suck. Made of high quality material, thus it is durable. Magnetic Levitation Coil ONLY, other accessories demo in the picture is not included. Material: Metal