Saltnets Reusable Snow & Ice Melting Mat No shoveling needed - this 29"x15.25" standard size mat melts snow or ice anywhere you place it Eliminates mess - patented design only releases enough of the melting agent necessary to melt Pet safe - salt net's nylon tubes prevent the melting agent from getting stuck in your pet's paws Works in frigid conditions - rated to work in temperatures of -15f or above Materials - casing: 100% nylon, melting agent: Calcium chloride, magnesium chloride, sodium chloride