Coils for experiments on induction in combination with the 120 mm diameter field coil (U12253) and for experiments on resonant electric circuits. The coils are only designed for safety extra low voltage (SELV). The spools are made of transparent acrylic plastic. Connection: 4 mm safety sockets Coil length: 170 mm Coil 1 Number of turns: 300 with taps at 100 and 200 turns Coil cross section: 50x50 mm