Although a silicone gel-filled breast implant often feels heavier than its equal volume saline counterpart, it is not. A silicone gel breast implant is actually just slightly lighter than an equal volume saline breast implant. The following calculation does not take into account the weight of the implant shell. And it assumes that the density of the silicone gel in the implants is approximately 0.97gr/cc. 1 pound = 453.592gr (round to 454gr) A Natrelle 15-492 breast implant weighs: 492cc x 0.97gr/cc = 477gr 477gr / 454gr = 1.05 pounds 1.05 pounds = 1 pound 0.8 ounces Two Natrelle 15-492 breast implants therefore weigh 2.1 pounds = 2 pounds 1.6 ounces. Best wishes.