BRISKHEAT Insulated Blanket Drum Heaters are designed to heat materials to high temps. and offer freeze protection and viscosity control in cold storage or where standard drum heater use is prohibited. Wrap-around Velcro enclosure. Knitted heating elements are positioned within lower one-third of blanket to avoid overheating when drum is not full. Silicone-coated outer surface. 6' cord and std. plug. 1-phase. Made in USA.NOTE: Heater expansion strip must be purchased for drums with removable lids.