VITON valve stem seals for all Audi S2 & RS2 5 cylinder Turbo engines. This valve stem Seals offer the following advantages: High-temperature strength Improved sliding Higher-life When using new valves and the guides must be replaced! Price for 1pcs stem seals. You need 10 pcs. Manufacturer Information about the manufacturer BAR-TEK BAR-TEK Motorsport GmbH Im Rauschen Auel 3, 51491 Overath-Brombach, Germany info@bar-tek.com