Guess Marble Case for iPhone 12 mini - BlackGuess Marble Collection The classic and timeless collection of fashionable Guess marble cases captivates with its elegant design. The beauty of the cool marble is broken by silver threads in an unconventional pattern, giving it a unique character. The case is constructed of durable thermopolyurethane, resistant to wear and tear. The hard polycarbonate back cushions it against shocks and ensures the phone's safety against unwanted scratches and damage.