a spring for urging {TAIL ~ the second end portions} of {HEAD ~ the pair} of hair retainers in a closing direction thereof, 
a spring for urging { TAIL ~ the second end portions } of { HEAD ~ the pair } of hair retainers in a closing direction thereof ,
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH