This high-performance spark plug wire set by B & B Manufacturing is designed specifically for GM 5.0L and 5.7L engines from 1987 to 1993. With a 10mm diameter, these yellow spark plug wires are made to enhance the ignition system's performance. The set includes all necessary components for a complete installation, and it is a genuine part manufactured by B & B. Additionally, it is important to note that this product is labeled with a California Prop 65 warning due to potential cancer and reproductive harm from prolonged exposure to the materials used.