  Nichrome wire. 
These coils are made of nichrome (nickel-chromium alloy) wire, and are meant as heating coils in a pottery kiln.  I got them as a teenager for making a furnace, which I used mainly for melting metals, not firing pottery. 
Source: Theodore Gray 
Contributor: Theodore Gray 
Acquired: 31 October, 2009 
Text Updated: 31 October, 2009 
Price: Unknown 
Size: 8" 
Purity: >60%
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