Adafruit like capacitors so much they have made a kids show about them.   They're super handy and it's really helpful to have a variety lying around to pick and choose from. This is a 10 pack of 10uF 50V capacitors so they can be used with any DC voltage up to 50V.  They have a tolerance of ±20% and long flexible pins that make them great for perf or breadboards. Remember that electrolytic capacitors are good for low frequency filtering (~1KHz or less), for higher frequency, pair up with a ceramic capacitor