"Road Runner Ice Melt Blend is an economical alternative to #477 Calcium Chloride Ice Melt. Road Runner contains 10% Calcium Chloride, 5% Magnesium Chloride, 5% Potassium Chloride and 80% Sodium Chloride. Road Runner is more effective than the #473 Deicing Rock Salt (-15oF compared to +20oF). Needs fewer applications than Rock Salt. Begins melting immediately upon impact. Generates melting heat fast."