Where can I buy bian stone in Jinan? What's the difference between 3A and 5A?

There are various kinds of ornaments. The difference between 3A and 5A mainly lies in the test data of the products. 5A has called beneficial elements and rare elements more than 5 kinds. Number of ultrasonic pulses. Penetration rate of ultrasonic wave to human body. Infrared popper bandwidth, irradiation intensity of infrared radiation. The fineness of mineral crystal grain size is better than that of 3A.5A, and the energy is stronger with less survival. The effect on personal health care is better than 3 years.