Specifications: This ?Wonderful Ring? set is used for the study of the electromagnetic force that is given off the magnetic field. When electric is transferred into the copper wires, it will transmit magnetic force which makes the ?Wonderful Ring? float up. How high it floats up is dependent on the strength of the magnetic field. This set consists of, the coil which has a diameter of 4.5 cm and is 8 cm in length. The cylindrical metal object has a diameter of 2 cm and is 35 cm in height, and of 2 sets of rings with different sizes. When the switch is activated, the wonderful ring will float up. This device uses 220VAC 50Hz. There is a switch and fuse which are installed in the base of dimensions 27x20x3.5 cm. The box is made of MDF wood covered with Formica plastic.