HOD HEALTH AND HOME Australia has been operating online and instore for 8 years. All products come with a 1 year warranty, fast shipping and special offers added to our site daily.. Material: River Stone Total Dimensions: (29-38) X (24-31) X 12 Cm (W X D X H) Drain Hole Diameter: 4.5 Cm With +/-10 Mm Tolerance For Height Why is there a color difference in the basin? River stone is a natural material meaning each basin has unique color variations. Some may be lighter or darker than the images shown while feature a mix of natural tones making each piece one of a kind. Why does the size of the basin vary? Since river stone is naturally shaped the dimensions of each basin may slightly differ in length and width. These variations add to the product's uniqueness ensuring every basin has its own charm. Why isn't the base of the basin completely flat? Due to the natural contours of river stone the base may not always be perfectly flat. Some adjustments may be needed when placing it on the platform to achieve a stable fit. How to care for the basin and prevent stains? Clean regularly with a mild non-abrasive cleaner. Avoid using harsh chemicals stiff-bristle brushes or abrasive sponges to prevent damage to the stone.