Inventories (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Summary of inventories
Raw materials	$ 126,563	$ 132,185
Finished goods	444,175	439,908
Low value consumables	36,528	37,058
Total	607,266	609,151
Less: impairment loss	(106,997)	(77,149)
Inventory, net	$ 500,269	$ 532,002

Amount of inventory low value consumables net of reserves.

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Amount of inventory reserves for last-in first-out (LIFO) and other inventory valuation methods.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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