Round head, 3mm head diameter, 17-19mm pin length switching, improved physical robustness and low energy consumption, easy to use Comes with a handy storage box, clearly labeled, you can easily find the color you are interested in Perfect for light decorations, torches, toys, car decorations, light box advertising, indicator and electronic and electrical experiment such as projects 500 pieces of LEDs in 5 types in one set, can be used for a long time, Manufacturer: Walfront