Heating Mantles feature insulated glass fabric that conforms to unusual vessel shapes. Spherical heating mantles cover both top and bottom of one-, two-,or three-neck spherical flasks. Mantles are made from flexible fabrics for effective heating and protection of glass vessels. Wrap around zipper holds the mantle halves snugly together to prevent heat loss. Top split allow mantle removal without disturbing the glass vessels. Maximum heating temperature is 842°>F (450°>C). Mantles include detachable 4-ft, two wire-cord with locking connector. Mantles require a controlled electrical power source to prevent overheating.