Deckorators 117687 Solar Pentwater Copper Post Cap Solar-powered post cap offers a soft glow without the hassles of wiring or electricity Made of durable copper-plated plastic and frosted glass for both beauty and performance Uses LED lighting, a long-lasting and energy-efficient way to illuminate your deck Inside of the post cap measures base 3-5/8" x 3-5/8" to fit a nominal 4x4 post LED light bulbs and rechargeable batteries are included