The company Ballistic was started when the owner dropped his phone getting out of his car, cracking the screen. Since then, they have been making protective cases for a wide variety of devices, today announcing the Ballistic SG (Shell Gel) triple-layer case for the iPhone 4. It uses three of the most different and most popular case materials -- soft silicone, hard polycarbonate and rubbery thermoplastic polyurethane (TPU) -- all bonded together to provide a strong mix of protection from drops and other shocks in a reasonably slim case.