Dissectible Transformer, new style, primary coil, 800T x0.71mmD wire, 240V.AC, fits 35x35mm 'U' core. Complete with removable mains cable and ON/OFF switch. The old model was a larger core (40x40mm) and the old coil formers were fabricated from Bakelite tube. The old formers were brittle and easily broken. This new style coil has overcome these problems.