- Wholesale 6" RIGID CASTER RUBBER - 6" x 2" - 500 Lbs Capacity. - Solid Rubber Tire Bonded To Cast Steel Wheel. - With Zerk Fittings For Easy Greasing. ⚠ WARNING: This product can expose you to DEHP, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.