Experience a flood of sensation Flow is a simple design meant for fluid movement. Perfect for seductive genital massage, the anodized aluminum flow feels smooth as it glides. Each end gives a different sensation and each end is fully functional and safe for the body. Its great for PC excercises and perfect for learning to relax the sphincter muscles. Aluminum is the most abundant metal in the Earth's crust. It makes up 8% of the weight of the Earth Solid surface. Its recyable and safe. Aluminum holds temperatures exceptionally well and is compatible with all personal lubricants. Each Tantus Alumina product is created in two fully functional sections. You can collect Alumina and interchange them with each other.