This kind of rosary is called Manizhu in Tibet. It is a rosary turned out with a prayer wheel as a washer. The beads turned out with a prayer wheel have the highest hardness, so the prayer wheel should be used. The prayer wheel, also known as the Mani prayer wheel (meaning Ruyi Zhu Bao in Chinese), is related to the six-character mantra. Tibetan Buddhism believes that the more you read the six-character mantra, the more devout you are to Buddha and Bodhisattva, and you can get rid of the pain of reincarnation.