The mass of fibers is characterized as possessing a bulk density of from 0.02 to 0.40 gram/cubic centimeter, and each of the fibers is characterized as having {HEAD ~ an average diameter} of from {TAIL ~ 3 to 10 microns} 
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The mass of fibers is characterized as possessing a bulk density of from 0.02 to 0.40 gram / cubic centimeter , and each of the fibers is characterized as having { HEAD ~ an average diameter } of from { TAIL ~ 3 to 10 microns }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL