50pcs 5mm 4 pin RGB Diffused Multicolor Common Cathode LED for Arduino DIY 5mm rgb leds great for electronic project, science project, paper circuits,DIY crafts and soldering ect. Easy to use, no need any circuitry. RGB diffused led it's a great choice for decoration Polarity : Anode (Shorter Part) | Cathode (Longer Part). Emitted Colour : Red / Green / Blue