Electrothermal MG Flexible Heating Mantle 115v 50/60Hz 300w P/N MG7805. Elastic heating element allows flat or round bottom flasks and flasks of wide tolerance to be used in the same mantle. Unique construction provides complete adherence to your flask and maximum heat transfer with the minimum of heat losses. The “fully enclosed” MG mantle retains the heat within the whole of the flask ensuring an economical maintenance of temperature. Eliminates the need for upper covers while still permitting observation of the contents. Lightweight construction.