The Chase Bays Fenderwell / Caliper Brake Lines for ZN6 / ZN8 chassis are for the enthusiast who wants to improve braking response, improve pedal feel, and upgrade to a more durable setup. They're a ONE PEICE design from the clip in the wheel well directly to the caliper. The OE FR-S / 86 / GR86 / BRZ rubber hard lines are upgraded and replaced with 3AN stainless steel braided, Teflon PTFE lined, black PVC coated lines with stainless steel hose ends. We use the best components in the industry and we pressure test every line we assemble and they are DOT approved. We guarantee leak free use if this product is installed correctly.