This Eisco Labs Comprehensive Basic Electricity Kit provides all the components needed to build and study simple circuits. The 3-part kit includes 12 cell holders, 4 electrode holders, an assortment of red and black leads (12 of each in 10cm and 4 of each in 25cm), 8 crocodile clips, 4 changeover switches, 12 carbon rods, bare wire, 4 universal clips, 8 soft iron rods, 4 fixed resistors, 4 rheostat units, copper foil, 40 bulbs, 20 bulb holders, 4 silicon diodes, 8 push switches, steel wool, polystyrene storage trays, and a teacher book. The entire kit stores in a sturdy plastic tub. Ideal for middle school and high school physics classrooms teaching the basics of electricity and circuit construction. Container color may vary.