{HEAD ~ Bonded magnets} are aligned around {TAIL ~ a shaft} so as to form a roller shape magnetic body as shown in FIG 2 
{ HEAD ~ Bonded magnets } are aligned around { TAIL ~ a shaft } so as to form a roller shape magnetic body as shown in FIG 2
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH