4" Diameter Black Plastic Medium Turntable Base For Medium Sphere and Large Pod EcoSphere. Wouldn't it be nice to see your EcoSphere from all angles without having to pick it up? These turntable bases have been specifically designed for each EcoSphere and will allow you to turn your EcoSphere without disturbing the shrimp and other lifeforms inside. It will also mean there will be less finger prints on the glass.