Spheroidal alumina particles have {HEAD ~ a combination} of high macroporosity, surface area, crush strength and low attrition loss and {TAIL ~ bulk density} 
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Spheroidal alumina particles have { HEAD ~ a combination } of high macroporosity , surface area , crush strength and low attrition loss and { TAIL ~ bulk density }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL