Carefree® No-Flat Solid Foam Non-marking Sawtooth microcellular polyurethane tread Open/closed cell construction One-piece steel hub 5/8" precision sealed bearing Two-year warranty Recommended Uses: Outdoor surfaces such as gravel, grass, and sand Rough or uneven surfaces Inclement conditions such as snow, slush, or mud

Heavy Duty Steel Hub Four Ply Sawtooth Polyurethane Construction Precision Sealed Bearings Foam Filled Recommended Uses: Outdoor Surfaces Such as Gravel, Grass & Sand Inclement Conditions Such as Snow, Slush or Mud Applications Requiring Superior Shock Absorption Rough or Uneven Surfaces