“U.S. No. 1” consists of pecans in the shell which meet the following requirements:
    
    
        
        (a) 
         Free from loose extraneous or foreign material.
     
    
        
        (b) 
         Shells are: (1) Fairly uniform in color; and,
     
    
        
        (2) 
         Free from damage by any cause.
     
    
        
        (c) 
         Kernels are: (1) Free from damage by any cause.