{HEAD ~ The golf club head} 1, wherein a width Pu of {TAIL ~ an upper portion} of each protrusion satisfy: 
{ HEAD ~ The golf club head } 1 , wherein a width Pu of { TAIL ~ an upper portion } of each protrusion satisfy :
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH