Graphite Maybe?

[banjags]

What is the blackish/Grey metal that monitors wires or keyboard wires are strung thru. It looks like graphite to me... is it? Is there a scrap market for this?

 

[Gotrek]

Ferrite

http://goldrefiningforum.com/phpBB3/viewtopic.php?t=1734

http://en.wikipedia.org/wiki/Ferrite_bead

 

[banjags]

is this material good for anything? Is there a scrap market for it?