The Natural Tan outer-case and Black aluminum-anodized inner-tank add class and sophistication to the classic white paraffin baths that have been in the market for decades. The Black tank helps to mask airborne impurities that may fall in the unit. The Natural Tan Therabath comes with a Limited Lifetime Warranty - an extension over the current 5 year warranty available with the standard Therabath - and 9 lbs. of Therabath Professional Refill paraffin.