Shepherd 4-Inch Swivel Plate Elastic Blue Rubber Caster, 265-lb Load CapacityThe Shepherd Hardware Elastic Blue Rubber Casters are designed with a super elastic rubber wheel that instantly regains its original form when a force is applied to the caster. As friction is considerably reduced, initial starting thrust required by user is brought to a minimum. The softness of this wheel will allow for easier rolling over obstacles, excellent rolling quality and noise reduction. These casters have fantastic abrasion resistance which