The Chase Bays Fenderwell Caliper Brake Lines are for the enthusiast who wants to increase braking response, improve pedal feel, and upgrade to a more durable setup. The OE rubber hard lines are upgraded and replaced with -3AN stainless steel braided, Teflon PTFE lined, black PVC coated lines. We use the best components in the industry and we pressure test every line we assemble. These are DOT approved! We guarantee a leak free start up if this product is installed correctly.