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Classic Tube's Stop Flex brake lines are made with Teflon hose, Kevlar braid, elastomer, and 304 stainless braided-wire construction, and have swivel ends to better orient the hose during attachment. We used them to eliminate spongy brake feel and to increase braking efficiency. Stainless Steel, on the other hand, claims that they aren't necessary. We like their practical advantage and good looks.