Pb fastener foam rubber feet black or grey packs of 12 pb fastener stra 12stge9306765 these grey foam rubber feet from pb fastener amp components come supplied in a pack of 12 and are suitable for applications such as housings and speaker cases where they can help reduce vibrations designed with a smooth surface and an outside diameter of 10mm pb fastener stra 12stge9306765 grey foam rubber foot pack of 12