The Wimhurst Machine is a visual and powerful tool used to create static electrical charge and high voltage sparks. The Leyden jars and disc are made of durable clear acrylic. The upright support and pulleys are plastic and resistant to breakage. Aluminum sheets are mounted to the sides of the acrylic disc. The apparatus is capable of creating sparks up to 2 inches long under proper weather conditions. The durable unit provides the best value for a classroom demonstration.