In the BEK Advanced Kit the components are mounted on bright yellow plastic bases each with two 4mm diameter sockets. Excellent for more advanced circuit work.Kit Contains:5000 Ohm Thermistor1N5401 DiodeWhite LED (30mA Max)100 Ohm 5W Variable resistor1k Ohm 0.5W resistor470 Ohm resistor100 Ohm 1W resistor47 Ohm 2W resistor22 Ohm 2W resistor10 Ohm 2W resistor2200uF capacitor10F super capacitorReed switch