Product Detail For generating electric charges and high voltage sparks. The unit is built with cast iron supports and pulleys. The leyden jars are a large size and the disc is a clear acrylic material. On the external side of each disc, aluminum segments are mounted.. Dimensions: 345mm x 345mm x 395mm. Instructions provided. . The "Wimshurst Machine, Deluxe" is best product for you. We recommended Wimshurst Machine, Deluxe