Rotary Corp brand aftermarket product. Caster Wheel Assembly replaces Toro 110-9965. 11x4.00x5 semi pneumatic, Reliance, smooth tread, Fits white. 3/4" tapered roller bearing. Comes with bearing cups, bearings not included. Fits Z300 and Z334 with 34" cut, Z340 with 40" cut. Toro GrandStand and Vantage. Same as Toro 112-3810 without bearing kit.