Only gripe with this study seems for me that these were measured at standard lab conditions @ 20°C, while they will be at body temperature while in use, maybe changing density. But the mass stays the same, so for our chat here that isn’t that important.
not much, it’s not pure silicon but mostly saline caught in a silicone matrix.
https://pmc.ncbi.nlm.nih.gov/articles/PMC4174160/ says density is between 1.03 - 1.07 g/ml, resulting in only 120-280 g more than pure water.
Only gripe with this study seems for me that these were measured at standard lab conditions @ 20°C, while they will be at body temperature while in use, maybe changing density. But the mass stays the same, so for our chat here that isn’t that important.