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 using 25% solar energy. 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.