{HEAD ~ A cross sectional shape} of each striation is an isosceles trapezoid having an upper base at {TAIL ~ the face side} and a lower base at the back side of the golf club head 
{ HEAD ~ A cross sectional shape } of each striation is an isosceles trapezoid having an upper base at { TAIL ~ the face side } and a lower base at the back side of the golf club head
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH