White color thermo-plastic construction. Installs in Kerf in door stop and creates magnetic seal with door. Flexible gasket compensates for unevenness in doors. Made for door frames with kerfs of at least 3/8 in. and door stop widths of 7/16 in. Steel door magnetic weather-strip with magnetic pulling power along with flexible gasket, compensates for unevenness in doorsMagnetic insert compresses against steel doors to provide tight sealFor door frames with kerfs of at least 3/8 inch and doorstop width of 7/16 inch