This Ferrea Audi/VW 1.8T 20V Valve Set is a set of 8 valves designed for high performance and durability. The valves feature a 29.9mm head diameter, 5.96mm stem diameter, and a 103.92mm overall length. They also feature a 26 degree valve face angle and a stock-style triple groove configuration for improved flow. The set includes a competition plus exhaust valve for improved exhaust flow. These valves are ideal for high performance builds and will provide reliable performance and long-lasting durability.