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Inventories
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories

3. Inventories

At December 31, 2017 and December 31, 2016 inventories consisted of the following:

 

 

2017

 

2016

 

 

 

 

 

 

 

 

 

Raw materials

 

$

901,600

 

$

1,074,156

 

Finished goods

 

 

125,932

 

 

112,535

 

Work in process

 

 

16,848

 

 

 

Valuation allowance

 

 

(643,616

)

 

(504,583

)

 

 

$

400,764

 

$

682,108