USA D.O.T. Approved Zone Offroad brake lines feature multi-layer construction including a teflon inner core, Kevlar liner, and braided stainless steel for virtually no volumetric expansion. This means a firmer pedal response with less effort in the drivers seat. These lines use standard SAE fittings and and comply with all Federal D.O.T. requirements. These are made to replace the factory rubber lines with the correct lengths for your lifted Jeep and improve performance so your brakes are there when you need them the most!