High performance valve stem seal for all 6 mm valves made of Viton. These valve stem seals offer the following advantages: High temperature resistance Improved sliding properties Longer service life Can be used on both intake and exhaust valves. When using new valves, the guides must also be renewed! Price for one stem seal. 24 pieces are needed. Manufacturer Information about the manufacturer BAR-TEK BAR-TEK Motorsport GmbH Im Rauschen Auel 3, 51491 Overath-Brombach, Germany info@bar-tek.com