Silicone Anti-Vibration Dampers

I just spotted these at  http://www.infinity-hobby.com and they seem to be pretty good value for money compared to what I have previously seen for silicone dampers. They come in 3 different compounds, which will presumably help filter out different frequencies of vibration. I've ordered the a set of 4 medium compound dampers to test and will report back with the results when I receive them.