4" *4" CORNER BUMPER GRAY PVC CORNER BUMPER FOR BARROWS CB-4 MATERIAL: GRAYPVC 4''x4'',7/8'' ... THICK,1'' HIGH STEEL ISERT. 4" *4" GRAY PVC CORNER BUMPER FOR BARROWS ITEM NO.: CB-4MATERIAL:92% PVC, 8% OTHER ... , AND A STRICT QUALITY CONTROL SYSTEM. 4" *4" GRAY PVC CORNER BUMPER FOR BARROWS