Features: When a current is passed through the coil, a magnetic field is generated around the coil. This additional magnetic field can generate external forces to the upper permanent Magnetic, or push or suck. By adjusting the magnitude and direction of current flowing through the coil, the forces can be adjusted to generate Stable magnetic suspension. Produced of high quality material, thus it is . Magnetic Levitation Coil ONLY, other accessories in the picture is not included. Material: Metal Specifications: Material: metal Outside Diameter: about 19mm/0.75in Height: about.12mm/0.47in Single coil resistance: 8-10Ω Package Includes: 5xMagnetic Levitation Coil note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.