The single Large- Flat Rock Cover weighs 29 pounds and is available in Greystone color. Exterior Dimensions: 42"L x 36"W x 5"H, Interior Dimensions: 36"L x 23"W x 2"H. Durable, this realistic faux rock is constructed of fiberglass for long-term use. This amazing fiberglass rock cover looks and feels like the real thing! It's by far the most realistic rock cover on the market. The TrueRock Cover blends beautifully into any landscape and is the perfect solution for hiding low profile items like pond skimmers, waterfall boxes or anything unsightly. Each TrueRock Flat Cover is made and hand-painted in the USA, so every rock is unique.