Shrimp Molting cave like seen in the pics below. These are hand molded ceramic caves small enough for shrimp but large enough for most caridinia sp. These give the shrimp a safe place to molt and hide as well as the ceramic that they will pick minerals from leading to easier molting. this is closed ended. It measures 3.25"wide X 2" deep and 1" high.
This is for the exact piece pictured