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Compressionless Housing
From WikiPedalia
Cable housing consisting of a bundle of more-or-less parallel wire strands, instead of the single coiled strand of normal housing. This is used for handlebar-mounted shifters, because the effective length of the housing doesn't change significantly as the handlebars are turned and the cable flexes. This is part of what makes reliable indexed shifting possible.
Compressionless housing must not be used with brake cables. It is not strong enough, and can rupture, causing brake failure. See also my article on Cables.
