rubber wheel 4.00-8 material:natural rubber rim:steel Using for Wheel Barrow, Hand Trolley, Platfrom Hand Truck And Tool Carts Ply Rating: 2PR, 4PR, 6PR Rim: Plastic Or Steel Other model: 2.00-4, 2.50-4, 3.00-4, 3.50-4, 4.10-4, 4.00-4, 3.50-5, 2.50-6, 3.50-6, 4.00-6, 5.00-6, 3.00-7, 3.50-7, 4.00-7, 2.50-8, 3.00-8, 3.25/3.00-8, 3.50-8, 4.00-8, 4.50-8, 6.50-8.