Rev Motoring Audi A4 A3 S4 B6 B7 Snub Mount Performance Duro Audi Snub Mount A4 A3 S4 B6 B7 Exclusive flat areas on the top and bottom provide optimal contact and longevity. Made of high grade polyurethane right here in the USA. 70A durometer to prevent added vibration. 2mm oversized to provide optimal contact and limit engine movement, prolonging the life of the expensive side motor mounts.