As the materials constructing {HEAD ~ the non magnetic base material}, polyester group such as polyethylene terephthalate and {TAIL ~ polyethylene naphthalate} and other various materials such as polyolefin group and cellulose derivatives can be used 
As the materials constructing { HEAD ~ the non magnetic base material } , polyester group such as polyethylene terephthalate and { TAIL ~ polyethylene naphthalate } and other various materials such as polyolefin group and cellulose derivatives can be used
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH