This soft plastic propolis screen will help you collect medical grade propolis from a strong hive. Cleats on the bottom side will prevent it from resting on the frames, keeping the bee space and preventing a hive beetle haven.
Simply place this on the top of the uppermost box with a vented shim or with the lid propped up to allow light in. The bees will seal it up to prevent light from passing through. You come back and remove the trap, place it in the freezer, and (after 24 hours) twist it to pop off all the clean propolis.