Rubber air spring for highly effective isolation of machinery and sub-assemblies against shock and oscillation. The bell shaped component is made of high grade elastomer. The construction allows a highly effective isolation without the disadvantage of excessive horizontal deflection. It is impossible for the element to break down as a result of overloading or a sudden drop in pressure. To reduce vertical dampening, the component is available with additional attenuation, see FAEBI HD below. The base plate is equipped with an anti-slip pad so there is no need to anchor the machine to the floor.