These are the same high-quality Primo Reinforced Plastic Casters that you are used to but we have added our high-performance Wheelchair Bearings 608-2RS bearings to them.
This pair of Pr1mo front caster wheels are made of high quality, lightweight, and durable composite plastics. The 1-1/2” wide wheel makes rolling over cracks and other obstacles much easier than thinner caster wheels that can get caught. Black 3-Spoke Primo Caster Wheel, Non-marking low profile black urethane tire. Wide 1-1/2” and 1" tire width has a rounded profile for reduced rolling resistance on hard flat surfaces.
Size: 4" x 1", 4" x 1-1/2", 5" x 1-1/2",6" x 1-1/2"
Bearing I.D. 5/16" 608-RS
Bearings included: Yes
Black composite rim: Yes
Hub width: 1", 1-1/2"
Tire profile: Rounded