This genuine Toro OEM 15 x 6.50-6 semi-pneumatic wheel assembly is a direct replacement for compatible Toro riding mowers and zero turn mowers. Semi-pneumatic wheels have a foam-filled or solid tire that provides ride quality similar to a pneumatic tire without the risk of puncture or pressure maintenance. Replace when the existing wheel is cracked, warped, or showing structural damage. Verify your model and serial number before ordering.