Mayne Fairfield 5823B Window Box Planter, 4-Foot, Black Mayne molded plastic planters are made from 100% high-grade polyethylene, with a double wall design creating a water reservoir. Outside Dimensions: 48"L x 11"W x 10.8"H. Inside Dimensions: 44"L x 7.5"W x 8"D Water reservoir capacity is approximately 4 gallons (15 Liters) Includes 4 wall mount brackets with a black powder coated finish 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.