The invention features a rubber thread that has, in {HEAD ~ cross section}, {TAIL ~ two or more rubber portions} 
The invention features a rubber thread that has , in { HEAD ~ cross section } , { TAIL ~ two or more rubber portions }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL