... consists of "V-shape"(or"W-shape")metal tape and nonmetal tape,which are overlapped each other and wound continuously.To ... and outer rings.2. Normally matrial used:A.Steel tape:08F,0Cr18Ni9(304),0Cr18Ni9Ti,1Cr18Ni9Ti(321),0Cr17Ni12,M02(316),00Cr17Ni14M02 ... and 0Cr18Ni9Inner ring:same as steel tape,special order is a available through negotiation. C.Nonmetal tape:flexible graphite,special made asbestos, ...