This product is a set of two Left and Right side catalytic converters for a 3.5L 2011-2014 Ford F-150 truck, designed to meet Federal EPA emissions standards. The converters are direct replacements with ceramic substrate material and stainless steel body material, featuring the Direct Replacement Series from NAT AUTOPARTS. They are specifically designed for the mentioned vehicle model and are not universal fitment, making them a suitable option for those seeking high-quality catalytic converters for their Ford F-150.