Mayne 4841-C Cape Cod Polyethylene Window Box, 4', Clay The Cape Cod window boxes feature a beaded panel design our melded plastic planters are made from 100% high-grade polyethylene This window box features a double wall design creating a water reservoir Outside dimensions: 48"L x 11"W x 11"H. Inside dimensions: 44.5"L x 7.5"W x 8"d. Water reservoir capacity is approximately 4 gallons (15 litters) The weather-proof and ultra-tough construction allows you to enjoy your window box all Year long with very little winter preparation 15 Year Warranty - residential application, 5 Year Warranty - commercial application. Made in the USA