Heat Spherical flasks with hemispherical style mantles. This series 0 mantle is a hemispherical style, meaning it covers only the bottom half of the flask. This allows full view of contents. The mantle accommodates single and multi neck flasks. It should be used with series 0 supports. All 115 volt items are CSA certified. Electrical connections: separable 4 ft., 2 wire cord and locking connector.