<prompt> Type of filler particle used in packable composite:Fibrous filler particlesMicrocrystalline filler particlesMixture of bothNone of the above  <response>: Specifically the packablecondensable characteristics are derived from the inclusion of elongated, fibrous filler particles of about 100 μm in length andor rough-textured surfaces or branched geometries that tend to interlock and resist flow.Phillips Dental materials 12th edition pg no 286 