High performance valve stem seals for all 6mm valves made from Viton. This valve stem seals offer the following advantages: -High-temperature strength -Improved sliding -Higher-life When using new valves also the guides must be replaced! Price for 16 seals. (16 seals per engine needed) Manufacturer Information about the manufacturer BAR-TEK BAR-TEK Motorsport GmbH Im Rauschen Auel 3, 51491 Overath-Brombach, Germany info@bar-tek.com