The Mayne Nantucket Window Box Collection features a bowed front, raised panel design, pronounced crown molding detail and built-in overflow drains. This window box features a double wall design creating a water reservoir. Mayne molded polyethylene window boxes are made from 100%; high-grade polyethylene. Includes 3 steel wall mount brackets with a black powder coated finish. Outside Dimensions: 48"L x 11.5"W x 10"H. Inside Dimensions: 43.5"L x 7.5"W x 7.6"D. Water reservoir capacity is approximately 3.4 gallons, holds approximately 5 gallons of soil. The weather-proof and ultra-tough construction allows you to enjoy your window box all year long with very little winter preparation. The UV inhibitors within the resin allows for a long lasting fade-free performance. 15 Year Warranty – Residential Application, 5 Year Warranty – Commercial Application. Made in the USA.