Carbide insert blades are reinforced steel blades with a cutout from the bottom where carbide is inserted. These are designed to increase the life of the snowplow blade.
Steel blades are the most common snowplow blade, and are typically made of heat treated steel to avoid breaking on road obstructions (potholes, manhole covers, bridge joints).
Rubber blades are lightweight blades that have a squeegee affect, and work particularly well to clear light snow and slush while reducing road damage. These blades often ship in a roll, and must be flattened before use.