Features:

1) Consists of "V-shape" (or "W-shape") metal tape and nonmetal tape, which are overlapped each other and wound continuously.
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2) To fasten the metal tape, both its start point and end point are tack welded.

3) Types: a) R type: spiral winding only b) IR type: spiral winding with inner ring c) CG type: spiral winding with outer guide d) CGI type: spiral winding with outer guide and inner ring.
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