CellPowerCasesTM Dobby - Protective 2 Layer iPhone 4 Black Case - Fits iPhone 4 & iPhone 4S 30 Day Satisfaction Guarantee. Cases are produced in and ship from the United States with USPS Tracking provided. This case provides sturdy, 2-layer protection while still allowing easy access to all ports and controls, and works with all service providers. This 2-piece case is made of a rubber, shock absorbent interior piece with a protective plastic outer shell, weighing only 1.7 oz. and is just 0.625" thick. The printing methodology used is sublimation, which offers a bright and durable print on an aluminum backing.