{HEAD ~ The present invention} is suitable for iron golf club heads, and particularly for middle iron golf club heads, {TAIL ~ short iron golf club heads}, and wedge golf club heads 
is suitable particularly for
{ HEAD ~ The present invention } is suitable for iron golf club heads , and particularly for middle iron golf club heads , { TAIL ~ short iron golf club heads } , and wedge golf club heads
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH REL REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH