CellPowerCasesTM Keep Calm Sparkle Blue iPhone 4 Case - Fits iPhone 4 and iPh... 30 Day Satisfaction Guarantee. Cases are produced in and ship from the United States with tracking provided. This lightweight and durable custom case allows easy access to all sensors, ports, and controls on your phone, regardless of your service provider This case is made of hard silicon, offering solid protection without adding a lot of bulk. The printing methodology used is sublimation, which offers bright and durable print on an aluminum backing.