American system "MEYER" inch needle regulations: 

 Model 
 Combination of content 
 Each count 
 M-0 
 0.011 "-0.060" 
 50 
 M-1 
 0.061 "-0.0250" 
 190 
 M-2 
 0.215 "-0.500" 
 250 
 M-3 
 0.501 "-0.625" 
 125 
 M-4 
 0.626 "-0.750" 
 125 
 M-5 
 0.751 "-0.832" 
 82 
 M-6 
 0.833 "-0.916" 
 84 
 M-7 
 0.917 "-1.000" 
 84