The silencer 1, wherein {HEAD ~ the fibers} of {TAIL ~ the fibrous material} have a maximum length of 5 mm 
of
The silencer 1 , wherein { HEAD ~ the fibers } of { TAIL ~ the fibrous material } have a maximum length of 5 mm
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH