0.8mm copper disc is used with slots cut with a saw. It is then pasted to a 4mm fibre glass disc. Metal carbon brush is used for the contact. Power supply consists of 'Layer' grounded transformer with ELCB to trip in case of any leakage. A SS resistor is connected in series to limit the current in case of short circuit. To avoid overheating of the power supply a timer is used to control the exhibit time. Magnets used are from old Winchister Hard drives with poles rearranged.