10 in. Industrial Casters (4-Pack)This pneumatic 4 Piece rigid caster is ideally suited for lawn and garden applications. Featuring a swivel design for a flexible range of motion. The durable zinc plated housing is surrounded by a 4 ply knobby tread tire that provides excellent traction. Perfect for keeping dollies, wagons or carts rolling smoothly Wheels are made of pneumatic tread and an inner core filled with pressurized air which remains inflated even with the weight of a vehicle