Power Cordz brake and derailleur cables are ingenious and revolutionary. Instead of the steel or stainless-steel cables that have been standard on 2-wheelers since 1902 (really), Cordz are made of about 10,000 synthetic fibers in a protective and slippery nylon casing. The synthetic material is called Zylon HM or PBO, which Power Cordz says is "a rigid-rod isotropic crystal polymer with superior tensile strength and modulus of elasticity" compared to steel cables. Although it may not be quite accurate to call Cordz "cables," I'll do it because the Power Cordz website does.
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