Jagwire teflon coated inner gear cablejagwire knows wire thats why its in their name friction in a shift or brake setup results in poor sloppy performance ruining the feel of any bike or system thats why their wire is manufactured to the highest standards in the industry and are tested and checked thoroughly during manufacture these slick stainless cables are sprayed with teflon and heat treated to bond the materials this coating fills in any imperfections in the cable surface further