{TAIL ~ Lateral ends} of each wrapping portion are formed into {HEAD ~ a Z shape} to produce the Z lock system 
{ TAIL ~ Lateral ends } of each wrapping portion are formed into { HEAD ~ a Z shape } to produce the Z lock system
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH