The Mediquip coolers provide an excellent method for keeping the grafts chilled. These are well designed coolers that hold a large reservoir of solid ice beneath the tray, which will keep the grafts chilled for up to 7 hours. They are filled, kept in the freezer overnight, and during the transplant procedure have just enough water added to reach the bottom of a petri dish which sits on the platform. As opposed to some other methods, the dish sits level. Not autoclavable.