{TAIL ~ The device} includes a pair of toroid magnets each having {HEAD ~ a north pole} and a south pole 
{ TAIL ~ The device } includes a pair of toroid magnets each having { HEAD ~ a north pole } and a south pole
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH