3 ms·Man that is one expensive piece of foam.by levigross 16y agoMan that is one expensive piece of foam.thristian 16y agoNot at all, it's worth negative $200.siika2000 16y agoAnyone know where I could buy some of that?yigit 16y agohttp://www.amazon.com/Sennheiser-HD555-Professional-Headphones-Channeling/dp/B0001FTVDQ http://www.amazon.com/Sennheiser-HD555-Professional-Headphon...deleted 16y ago[deleted]