Rubber air spring for highly effective isolation of machinery and subassemblies 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. Note: For outdoor use (e.g. isolation of a roof top air condition unit) the FAEBI® can be supplied in a stainless steel and EPDM elastomer version.