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