4" Rigid Caster - Black/Gray PolyU on PolyO Wheel - Model 3 3BK4x1-1/4-R Price:$9.30    Each 250 Lb. Maximum Capacity Each 4" Black/Gray Polyurethane on Polyolefin Wheel with Precision Ball Bearings. Photo shown with 5" Wheel. Home | Application Tips | Standard Products - Casters and Caster Wheels | Warranty | Summary | Contact Us Casters - Helpful Tips | Special Products - Casters and Caster Wheels | Web Resources | Site Map Photos & graphics are for informational purposes only. Actual product may vary slightly from those shown. Wheel colors may vary unless specified. If wheel color is important, please contact us for current inventory.