Sibin's definition of pumice can be understood as a kind of stone on the river surface in the ancient Sishui River Basin, with black and yellow colors. Sibin pumice is the earliest stone named in China. The Qing ware made of it (the special instruments, utensils and artifacts of the ancient Gong royal family) is called Spencer Pumice, which was a tribute more than 4,000 years ago. Modern people make use of the characteristics of Sibin pumice to make it into physical therapy instruments such as scraping boards, bracelets and necklaces, which are used for daily health preservation and disease conditioning.