S-groove twist series
  Single-direction twist series
  Dual-direction twist series
  S-groove twist series
  Square tooth series
  Single-direction twist series
  Dual-direction twist series
  Dual-color twist series
  Schmidt series
  Cross series
  Montblanc series
  Single-direction twist series
 
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Metal twist mechanism
S-groove twist series 
 
 
Metal twist mechanism
Square tooth series 
 
 
Metal twist mechanism
Single-direction twist series 
 
 
 
 
 
Metal twist mechanism
Dual-direction twist series 
 
 
Metal twist mechanism
Dual-color twist series 
 
   
 
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