The product is a set of 4 Genuine Denso Iridium TT Spark Plugs, model number IK16TT / 4701. These spark plugs have a pre-gap size of 0.040 inches, a reach of 19.00 mm, and a thread diameter of 0.551 mm. They are direct replacement spark plugs made of iridium material with a resistance of 5000 ohms. The spark plugs have a flat seat type and a hex size of 16.0 millimeters. They come with a 1-year manufacturer warranty and are interchangeable with part numbers IK16TT, 4701, 12582002, and 19302726.