Dottie WPI25 - Wall Plate Insulation Gasket is made of flame retardant polyethylene and comes in a pack of 25. This energy-saving gasket prevents loss of heat and cold through outlets and switches. It features a universal size, one-piece design, pre-cut serrated outlines for devices, and is compatible with regular toggle, duplex receptacle, and Decora wiring devices. The ivory-colored gaskets are essential for maintaining energy efficiency in any home or building.