Laboware is presenting the product best in quality, Electromagnetism Coil Science Labs Laboware is Manufacturer, Exporter Supplier of Electromagnetism Coil Product description: For demonstrating the effect of electric discharge from points. The apparatus has a 60mm diameter, Three-pointed star wheel with all the points curved in one direction. The wheel rotates freely on a pivot point mounted on a short stand and the stand is provided with a 4mm connection socket on its round moulded base.