These spring mounts offer excellent vibration isolation for equipment with operating speeds of 500 RPM and higher. Powder coated, cast iron housing with steel springs. A non-skid neoprene sound pad for lowest possible noise transmission. Springs are color coded for easy identification. Can be used on compressors, pumps, motors, fans, blowers, gen-sets, HVAC equipment and all types of reciprocating, non-mobile equipment.