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Inventories, Net (Tables)
6 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories, net

   September 30,   March 31, 
   2019   2019 
   (unaudited)     
Raw material  $341,759   $315,686 
Finished goods   526,223    715,344 
Provision for inventory   (21,701)   (23,112)
   $846,281   $1,007,918