Diy Case Keep Calm Iphone 4/4S Case Hard Case Fits Sprint, T-mobile, AT&T and Verizon IPhone 4s Case 101529 Made from durable plastic. The case covers the back and corners of your phone. Keep your Iphone 4/4s safe and protected in style. Shock absorbent, shatterproof, and anti-scratch material. Applicaton and removal are easy. TPU is more cut and tear resistant than rubber. It is abrasion resistant, and has a high degree of transparency.