Gradia Direct Lo Flo Syringes - A3.5 High viscosity flowable HDR microfilled hybrid composite Hydridizes a new evolutional and patented type of pre-polymerized filler called HDR with, inorganic filler (Fluoro Alumino Silicate Glass) and nano silica filler To be used not only for Class V or as a liner, but also for Class I, Class II and Class III restorations A pre-polymerised filler called HDR with inorganic filler (fluoro alumino silicate glass) and nano silica filler.