| 01. CLOSED HEAD RING | 02. OPEN HEAD RING | 
  
    | 
        
          | Code | L×W×H ㎝ | L×W×H inch |  
          | AP 001 | 9×4×2 | 3.5×1.6×0.8 |  
          | AP 002 | 14×6×3.5 | 5.5×2.4×1.4 |  
          | AP 003 | 20×7.5×7.5 | 7.9×3.0×1.8 |  
          | AP 004 | 20×7.5×7.5 | 7.9×3.0×3.0 |  | 
        
          | Code | L×W×H ㎝ | L×W×H inch |  
          | AP 011 | 9×4×2 | 3.5×1.6×0.8 |  
          | AP 012 | 14×6×3.5 | 5.5×2.4×1.4 |  
          | AP 013 | 20×7.5×4.5 | 7.9×3.0×1.8 |  
          | AP 014 | 20×7.5×7.5 | 7.9×3.0×3.0 |  | 
  
    | 
 03. OPEN HEAD RING WITH CUT | 
 04. CONTOURED HEADREST | 
  
    | 
        
          | Code | L×W×H ㎝ | L×W×H inch |  
          | AP 011/C | 9×4×2 | 3.5×1.6×0.8 |  
          | AP 011/C | 14×6×3.5 | 5.5×2.4×1.4 |  
          | AP 011/C | 20×7.5×4.5 | 7.9×3.0×1.8 |  | 
        
          | Code | L×W×H ㎝ | L×W×H inch |  
          | AP 081 | 19×19×6 | 7.5×7.5×2.4 |  |