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