All Ruby Cups (clear and in colours) are made of medical grade silicone and have passed tests according to FDA standards. For the coloured Ruby Cups, medical grade SLR based dye is used, which has passed the same tests using FDA standards.

The medical grade silicone is premium quality, CPSIA compliant (tested for lead and phthalates) and has passed ISO10993 biocompatibility test (biological evaluation of medical devices). The material is hypoallergenic, non-absorbent and contains no harmful additives or chemicals.