Constructed of durable Envirostone for years of enjoyment Attractive finish pairs beautifully with existing patio décor and will not stain your deck or patio For use in stabilizing umbrellas with a cross bar base, such as cantilever or offset type umbrellas Sold as 1 piece, but intended for use as a set of 2 or 4, depending upon your umbrella Each section weighs 12kg/26.5lbs