The Rock Box Propane Tank Cover from Boulder Looks is a faux-rock cover that fits over standard 250-gallon propane tanks. The cover features an articulated lid that rolls back when access to the tank is necessary. The Rock Boxes PTCs come in five natural colors so homeowners can match them to existing landscaping or geography. The product itself weighs approximately 200 pounds, is approximately 1 inch thick and is made from a composite of fiberglass roving -- a material that is higher quality than that used to make boats.