Ball Top Post Cap with dental molding, made from kiln dried clear western red cedar. Available in many sizes, in any quantity. Standard size is 3-5/8" - this is the opening of the cap, meant to fit over a nominal 4x4 post. Ball size is 3" in diameter for 3-5/8", 3-7/8", and 4-1/8" cap sizes. Ball size is 4" in diameter for 4-5/8", 4-7/8", 5-1/8", and 5-5/8" cap sizes.