Special "living hinges" allow the entry and exit walls to be driven over without manually lowering and raising the walls. The end walls automatically spring back into position after being driven over. Sidewalls are supported with manual PVC assemblies that swivel to lower the walls for transporting drums and equipment into the berm area. Easy on the budget, this easy to use containment berm is suitable for drums, IBC's, vehicles, equipment, frac tanks and other large containers. Sump color is Black. Construction: Ethylene copolymer trademarked as Copolymer 2000. Other materials available upon request.