Sorbothane is far more effective for isolation than other materials such as rubber; it dampens vibration and impact by converting it into a small amount of heat. It has many applications; it is widely used by audiophiles to help isolate turntables (and neighbours!) from subwoofers and speakers or from the unwanted influences of other equipment and traffic rumble, it is used to quieten the vibration from PCs, hard drives, DVD drives and other spinning equipment, for protecting sensitive scientific equipment, it is even used by NASA to isolate vibration and in the recoil pads of guns. The domed shape of these Fonotek hemispheres further helps isolation by minimising the points of contact. They can be used domed side up or down. They possess their own natural tackiness which clings to most surfaces. If you require a more permanent application, correctly sized 3M peel and stick adhesive transfer circles are also included, these are supplied separately so that you can choose to use them, or not. These Fonotek hemispheres are '50 durometer'; this is the measurement of their hardness or of the amount they 'squish' when loaded and it greatly influences the load rating. This is the mid load rating of most sorbothane products and is the preferred option for most audiophiles and domestic users since it provides the best equilibrium for protection against both high and low frequency influences; other durometer ratings are commonly used for specialised applications including high/low frequencies or temperatures. Sorbothane has a high plasticiser content which gives it a natural 'stickiness'; this is harmless to most surfaces, but can stain some others including varnish, paints and wood; they are supplied with a urethane coating which provides some protection but this can wash or wear off so you may wish use the supplied transfer circles or a small piece of cling-film etc. for further protection. Made in the UK.
D**.
They do reduce vibration.
When four are fitted under a loudspeaker, they actually do reduce the transfer of vibration to the speaker stand. Highly recommended.
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