How many manufacturers specialize in the production of Feng Shui balls in Chengdu?

There are many manufacturers that sell Feng Shui balls in Chengdu. As far as I know, there is a manufacturer in Chengdu that specializes in the production, design, installation and maintenance of Feng Shui balls. The only manufacturer with a ten-year marketing history is Guangdong Ruchuan Enterprise- In Fulong Stone Market and Hongxing Stone Factory, the Feng Shui ball products he installed cover almost every county and city in Sichuan.