LEDs for OO/HO signals (3MM LEDs) 5 Red 5 Amber & 5 Green LEDs + 15 1K resistors
£2.50
5 Red 5 Amber & 5 Green LEDs + 15 1K resistors. A 1k resistor will be okay for up to around 16 volts DC. You will also get 1 yellow 3mm LED as a comparison with the Amber LEDs.