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Comprises 120 mm diameter aluminium disc having 20 mm driving pulley. Mounted on base. For demonstration of eddy current braking when used in conjunction with the hand wheel driving unit. The 120 mm diameter aluminium disc has a 20 mm driving pulley. The powerful circular magnets are carried on a pivoted arm so that they may be moved over or away from the disc as required. Size 16 x 16 cm