This genuine Toro OEM pneumatic caster wheel kit replaces worn or damaged front caster wheels on compatible Toro mowers with a pneumatic tire assembly that provides improved ride quality and maneuverability compared to a flat tire or solid caster. Pneumatic casters absorb small bumps and surface irregularities that solid casters transmit directly to the deck, resulting in a more consistent cut on uneven ground. A wear-and-tear replacement that also improves performance. Verify your model and serial number before ordering.