Plastic has been used in beehives as part of foundation for brood frames for many years. Our Flow Hives only feature the highest quality, foodgrade, BPA and BPS Free plastic in the Flow Super where the honey is stored. The bees complete the Flow Frame matrix and coat it with wax before adding their nectar to turn into honey. We supply and recommend foundationless brood frames to keep the brood nest as natural as possible for the bees.