Made of black 100% recycled ABS plastic or white 80% recycled ABS plastic with virgin ABS cap on each side. Made to last at 0.160 in gauge thickness. Manufactured in the USA. Easy-to-clean design allows the grower to clean their reservoirs without the hassle of scrubbing sharp corners to remove build up. Built-in water level indicators to easily identify the fill level in the reservoirs. Lids are not available for Duralastics? Reservoirs.