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3" Heavy Duty Clear - Caster Wheel Metric Needle Bearing 🟢 Ball material: Si3N4 silicon3" Inch Heavy Duty Clear Swivel Caster Wheel with 220lbs Load Rating 3"Inch Heavy Duty Clear Swivel Caster Wheel with Plate and 220 lbs Load Rating. This Clear polyurethane casters used of High Quality PU material, can delivers more smooth, quiet rolling and easy maneuverability without scuffing up your floors. With 360 degree ball bearing swivel and a black color plated carbon steel square plate, this swivel caster safely supports up to 220 lbs. 3"