The product is a 4 pack of Motorcraft spark plugs designed for Ford, Mercury, and Lincoln vehicles from 1983-1994. These spark plugs are made of copper and are a direct replacement for the original equipment manufacturer (OEM) parts. With interchange part numbers such as SP409, AWSF44, and T16NRU11, these spark plugs provide reliable ignition performance for engines with displacements ranging from 2.3 to 5.0 liters. The set of 4 spark plugs is guaranteed to ensure optimal engine function and efficiency in various vehicle models