Tantus Alumina is made of 100% aeronautic grade aluminum and designed to play anatomically with your body's pleasure zones. Aluminum is a lighter metal than stainless steel, it doesn't feel so heavy. Each toy is anodized which not only adds to the beauty, but increases corrosion resistance and wear resistance. Aluminum is the most abundant metal in the Earth's crust. It makes up about 8% by weight of the Earth's solid surface. It is recyclable and safe.