This invention relates generally to wheeled luggage, and particularly to wheeled luggage with one or more controlled wheels for improved tracking and steering control of the luggage case when it is in motion. A magnetic core for a current transformer comprising the composition represented by the general formula: Fe100-x-a-y-cMxCuaM\u2032yX\u2032c, wherein M is at least one element selected from Co and Ni, M\u2032 is at least one element selected from V, Ti, Zr, Nb, Mo, Hf, Ta, X\u2032 is at least one element selected from Si and B, and x, a, y, and c meets the composition of 3\u2266x\u226650, 0. Each of the outer legs is notched, thereby increasing their flexibility and enabling the wire slot to open wider in order to accommodate a large range of wire sizes. A bowl connector portion includes a front shield bracket connecting the flow diverter to a rim of the toilet bowl. The apparatus includes a controller for controlling a Peltier element on the basis of an operation control signal from the main controller, and controlling heat movement by the Peltier element, the Peltier element being set at or near an object to be temperature-controlled in real time.