While four rollers are shown, the number and {TAIL ~ size} of the rollers may vary with the type and size of {HEAD ~ fiber} being treated 
While four rollers are shown , the number and { TAIL ~ size } of the rollers may vary with the type and size of { HEAD ~ fiber } being treated
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH