The blue one in the center is about twice as large (volume not length) as the small black one.
The two smallest are both 22 ufd, 5% tolerance and 100 Volts ratings.
In the photograph above are three capacitors. It is what makes our permanent magnets work, causes speakers to drift off center position, and what make a magnetic cored inductor distort even without saturating. Hysteresis is the storage of energy in a medium. This effect (DA) is also known as dielectric absorption hysteresis. Use of polystyrene, polypropylene and Teflon as dielectrics will keep this effect to a minimum. Problem is, the dielectric is not supposed to store a charge. The energy which returns comes from the electrical insulating film, or dielectric, in which it was stored. With Dielectric Absorption (DA) even after the initial voltage gets removed from the capacitor terminals by shorting out the capacitor, the capacitor returns to its prior state of charge without any signal being supplied. This dielectric material is how we specify the capacitor type, e.g., mylar, polypropylene, electrolytic, ceramic, etc. The dielectric is the material which insulates the two electrically conductive rolled plates in contact with the capacitor terminals. This is a fancy name for capacitor memory. There are many non ideal behaviors that capacitors show, but perhaps the worst is dielectric absorption. (For those of you who want to read more detail on the performance issues with real world capacitors, there is an excellent treatment of the subject in Wikipedia ).