The MTI Collection tubs are individually manufactured and handcrafted using proprietary SculptureStone. They are available as soaking baths or air bath, in white or biscuit and with a soft matte or hand polished deep gloss finish. Each tub undergoes multiple quality control checks, including individual water-testing and component operation. SculptureStone is a proprietary material used exclusively to create the MTI Collection of tubs, sinks and counter-sinks. The solid works of molded stone are smooth, 100% solid throughout, non-porous, stain-, mold - and mildew-resistant making cleaning and maintenance easy. The poured technology allows for innovative styles that have won more than 50 design awards, the company says. The MTI Collection allows you to choose from six exterior colors to accent or integrate with the bathroom decor available on many tubs in matte or gloss finish.