These are nice looking and high quality ceramic capacitors. Although electrolytic capacitors are generally used for capacitance above 1 uf, sometimes replacing an electrolytic cap with a ceramic one might serve some advantages like low equivalent series resistance, usefulness to higher frequencies, less heat sensitivity, much better lifetime. However, they are only useful for lower voltages. So it recommended to use them in low voltage DC power supplies. This pack contains 5 x 10 uF ceramic capacitors.