{TAIL ~ The non magnetic material} has {HEAD ~ a relative permeability} of not greater than 15, for example nylon, polytetrafluoroethylene , or polyethylene terephthalate  
{ TAIL ~ The non magnetic material } has { HEAD ~ a relative permeability } of not greater than 15 , for example nylon , polytetrafluoroethylene , or polyethylene terephthalate
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH