254pcs in total components(Resistor(0.25watt) LED Switch Potentiometer Caps pin header screw). 12x12mm big switch with 5 kinds of colorful caps(red yellow blue green black). Manufacturered by Haitronic. 10 kinds value of resistors(range from 10R to 1M) each 20pcs. 2 x B50K Potentiometer with 2 gasket and 2 hexagon nut. Qualified electronics component pack for various basic Arduino starter kit project.