From anime and manga Dragon Ball Z, this is Dragon Ball : Replica of Dragon Ball Z Crystal Glass Balls 7pcs 4.3 cm. Dragon Balls are the namesake artifact of the Dragon Ball series. They are orange, crystalline spheres with the ability to call forth the Eternal Dragon Shenron who has the ability to grant wishes to anyone who gathers all seven of them.
In the Dragon Ball: Bouken Special, the Dragon Ball manga author, Akira Toriyama, explains that there are seven Dragon Balls because there are eight balls in Hakken-Den, a famous Edo-era Japanese novel, and that he would have hated for them to be exactly the same number, so he had the Dragon Balls be seven.
Unlike other forms of fiction that involve wishes being granted, the Dragon Balls seem to grant a wish exactly as the wisher imagined it, rather than warping the wish so that it is technically granted, but ends up making the wisher’s life even more difficult. For example, when King Piccolo wished for youth, he was not reduced to an infant, but rather, appeared in his prime. Also, when a victim is revived from the dead, they are not undead, but rather, are truly alive. This is likely so that there is a legitimate reason to pursue the Dragon Balls by the protagonists, as they would not have a justification to rely on them if they knew they would never grant a proper wish. Also, unlike wishes in other literary works, Shenron is actually a sentient being; he may be capable of interpreting a wish however he sees fit, but chooses to interpret them how he knows the wisher actually wants, as a courtesy rather than as a rule. Credence is lent to this theory in the movie Dragon Ball Z: Fusion Reborn, where Shenron was asked to move all the dead people back to the Other World. He claimed that he was perfectly capable of granting the wish precisely as it was uttered, but he knew what consequences the Z Fighters were expecting (that the onslaught of undead would be resolved and peace would be restored), and warned them of the futility of the wish.
Dragon Balls come in sets of seven with each ball containing the number of stars that signifies its respective number in the set. It was said by Colonel Silver that the Dragon Balls are unbreakable when he dropped a fake Dragon Ball.Vegeta probably did not know this when he ordered Krillin to destroy one before the Ginyu Force took them on Namek. In the Fusion Saga, while Super Saiyan 3 Gotenks is fighting Super Buu, Piccolo says “If you break even one of the balls they can never be used again”, which may mean that they are not completely indestructible, though the balls were turned to stone at the time, so that might have been the cause for the warning.
Dragon Balls are difficult to find because they are scattered all over their respective planet, or all across the universe or galaxy according to the FUNimation Dub in the case of the Black-Star Dragon Balls, and are deactivated for a year after every wish, disguising themselves as stones. To have the opportunity to summon an Eternal Dragon, one must travel all over the globe to retrieve them. As technology eventually progressed, this became somewhat easier, and became relatively simple with Bulma’s invention of the Dragon Radar. Though the Dragon Balls usually scatter across the Earth after having been used, Goku stops this from happening once by jumping into the air and catching the Four-Star ball before it can fly away at the end of the Fortuneteller Baba Saga. See details