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