It will drop powder. Zhang Zhongjing's herbal health care is to gather hundreds of Chinese herbal medicines, dry them and sew them in the quilt, so that people can take medicine through skin aromatherapy during sleep, which not only reduces the damage to internal organs caused by taking medicine, but also makes the herbs in the quilt dry and brittle after being used for a long time, and often rolls the quilt, and the herbs inside will be ground into powder over time.