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By changing the traditional way shrink the mop, to improve the extent of shrink and the experience of using. Usually, the traditional way only has two sticks. One reason of this is the traditional way shrink the mop by the thicker stick covers the thin one. So if the mop has four sticks, the thinnest one will be too thin. Now, a new way by four sticks staggered together can let the mop shrinks more than before, and without the problem about the thickness. And this new way is more fun than before.