| abstract | - Dragon Balls come in sets of seven with each ball containing the number of stars that signifies its respective number in the set. Dragon Balls are difficult to find because they are scattered all over their respective planet (Earth and a few other planets which have their own set), and are deactivated for a year after every wish, disguising themselves as stones. To have the opportunity to summon a Dragon, one must travel all over the globe to retrieve them. As technology progressed, this became somewhat easier, and became relatively simple with Bulma's invention of the Dragon Radar. Restrictions on the Dragons powers are set by the relative capabilities of the Dragon Ball set's creator. A big problem throughout the series is that with any set of Dragon Balls is that their creator must be alive for them to function, otherwise they will be stones for eternity. This often results in the Z Fighters protecting their creator with their lives. Since all seven Dragon Balls must be brought together (though it is unknown exactly what the maximum distance between the balls for them to be considered together is), it is often a sound strategy employed by the villains of the series to find one Dragon Ball and hold on to it, while the Z Fighters go through the trouble of finding the other six, after which the villain will step in and steal them. Since this strategy technically works, but is considered cheap, the Z-fighters do not usually employ it, as they prefer to fight fair.
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