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About product and suppliers:
        During the research period (Dec 2016 to Nov 2018), major trends on sales, online shipping, product and requirements data were anlysised for Roofing Sheet, Ppgi, Pipe, Galvanized Steel Coil, Plate Steel, Galvalume Coil, Steel Profile, Structural Steel, Cold Rolled Coil and Roll Forming Machine etc.  And the result was as the following.
Global Market Demand trends: Long-term Metal Roofing Sizes index consecutive growth to the top high in Nov 2018. 
Alibaba.com Sourcing trends: Long-term Metal Roofing Sizes index consecutive growth to the top high in Nov 2018. 
Online Sales trends: Along with 9 months consecutive falling, the Long-term Metal Roofing Sizes Index steadily drop to 34 a new low in Nov 2018. 
According to the trends of the three indices, The consultant suggested that the Metal Roofing Sizes is still a product with market potential, but it needs to be carefully study how to decrease your cost and focus on the new products and hot products supplied by partners from Alibaba.com.