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The best quality repack material. This comes in one continuous long strand and in a bag. Just put in two or three bags (I use 3 bags for the bigger oval silencers) and reassemble. When you start up, the bag quickly melts.
Do not pack the silencer too tightly as the filaments of the material vibrate to cause the silencing effect. Because it is one continuous strand, it cannot blow out like Fibre-glass packing.