Rings of Marrow Stimulation

Sym-Tech Item, rare (requires maintenance/attunement)
This sym-tech set consists of three rings, four bracelets, one necklace, and one belt, each designed to stimulate a creature's bone marrow (or equivalent) to produce more cells that help with healing and resisting disease. Your Constitution score is 19 while you wear these rings. It has no effect on you if your Constitution is 19 or higher without it.