ISSB-40 Isolation Speaker Spike Bases are manufactured from a sophisticated and revolutionary polymer with unique anti-vibration and damping capabilities. ISSB-40 isolate speaker spikes from the supporting surface, protect speakers from external vibrations and suppress internal speaker resonances. ISSB-40 also serve as protection for the surface itself by removing the risk of spike scratches and marks. In addition to that, ISSB-40 can also be used to upgrade all kinds of audio racks and stands terminated with spikes.