Marble Flour resin filler. 300 mesh superfine natural ground marble dust. Adds weight and coolness to resinous casts giving a feel closer to stone. Will also improve impact resistance and resilience. Not coated like BLR so will increase your vicosity as you add it, so be careful not to make your resin mix to thick by excessive addition. Start at 50% and work up or down to match resin viscosity to the job.