Benseki (Sihai Floating Stone) It is said that when rubbed against the human body, it emits far-infrared rays, which improve blood circulation and the flow of "ki" (vital energy). It is also said to generate ultrasonic waves, which are effective for blemishes and wrinkles. This stone is also used for Gua Sha. Purchased from a stone specialty store. Worn 2-3 times and then stored at home, but I am selling it to organize my collection. 1mm beads x 18 The size is just right for the wrist of an average woman.