A series of problems of pendulum

Oh, well, if you haven't played before, if you buy it for the first time, you should buy a white crystal. White crystal and pink crystal are relatively cheap, but white crystal has stronger mental magnetic field and better color. One gram is 6 yuan, which is 40-50 yuan. I have to say, the color is beautiful.

The pendulum of the green ghost is twice as expensive. As for how big it is, I like the big horn. It's too floating.