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 2 steel wall mount brackets with a black powder coated finish. Outside Dimensions: 24 in. L x 11.5 in. W x 10 in. H. Inside dimensions: 19.5 in. L x 7.5 in. W x 7.6 in. D. Water reservoir capacity is approximately 1.6 gallons. Holds approximately 2.5 gallons of soil. Optional decorative brackets add a beautiful finishing touch, sold separately. 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.