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