Tibetan tantric monks are chanting while ringing bells. What's it called?

It is a "prayer wheel", and most of it is a six-character Daming mantra sent by Bodhisattva, so it is also called "magic ring wheel". Because turning the wheel in the right direction is equivalent to reciting the merits of mantras in the wheel, Tibetan monks and secular believers generally practice virtue in this way. It is also very common to build a circle of large prayer wheels around the temple wall. When the prayer wheels are turned clockwise, monks and laymen turn around the temple in an endless stream. If you go to Tibetan areas, you can see Buddhist believers who turn the wheel by hand and recite the six-character Daming mantra.

The method of chakra teaching comes from ancient Indian Buddhism, which has a pure inheritance from the Buddha. It was not invented in Tibet, but also in the Han Dynasty. It is called "wheel wheel" or "wheel wheel", which began in the Southern Dynasties when Liang replaced Fu. When we hold a mantra or a Buddha's name, it comes from our inner desire and is reflected in our spoken language. When pushing the warp wheel or building the warp wheel driven by wind or water, it is also a good wish from the heart. The only difference is that this good wish is reflected in the body movements. In essence, this is also a kind of practice, so it can also bring benefits.