Sorry to disagree, but I use a moisture-sensor so that my dryer stops when clothes are "optimal" and where there is polyester, unless clothes are left too damp to put away, there is static. Damp towels do not dry, once folded and put away, they simply molder. So I have to have the clothes dry... but they are not being overdried in order to produce static. In winter, when the air is dry, the static was there unless the clothes were palpably damp. The outdoor clothesline was attached to the neighboring apartment building, but it fell down, and now my neighbor has a vertical garden that my clothes tended to snag on when the line was fixed. We couldn't string the line high enough to clear the neigbor's garden structures... so until we find a solution (perhaps a turnstile if there is adequate clearance, but our property line there is just the dripline around the house) for an outdoor line, it's drying indoors on hangers and dealing with terrible linty clothes until we have to replace the washing maching, or it's use the dryer.
Anyway, the aluminum balls work great. Thanks for the reminder to those who may be overdrying their clothes, that it is unnecessary, hard on clothes, and wastes energy.