This iPhone 7 Plus case uses anti-gravity / nano-suction technology. Nano-suction is a technology that uses vacuum, negative fluid pressure and millions of nano-sized suction cups to securely adhere any object to a flat non-porous surface. When the nano-suction object is pressed against a flat surface, millions of miniature suction cups create a large vacuum, generating a strong suction force that can hold a tremendous amount of weight. The nature of the technology allows easy removal without residue, and makes it reusable. If the back of the case becomes dirty, simply use water to clean so one can reuse the case. This product will stick to glass, paint, whiteboards, metal, kitchen cabinets or tile and smooth flat surfaces. This comes in handy if you wish to use it in a car for GPS purposes, or if you are watching a game or show while putting on makeup, shaving etc. This product uses Fulfillment by Amazon (FBA). This means that this anti-gravity / nano-suction iPhone case is stored in Amazon’s fulfillment centers where Amazon packs, ships, and provides customer service for this product.