The Series M Mantle has a durable aluminum housing outside and resilient glass fabric inside to support flasks and protect flask walls from the thermal strain. Only the bottom half of the flask is covered so the contents being heated are fully visible. All mantles have a seperable 4-foot long, 2-wire cord and locking connector. The internal operating temperature is 450-degrees Celcius. Voltage is 115V and 230V for 72L. Grounded through the housing. Requires a support. Power controls are recommended.