USAMS Primary Case . The transparent USAMS Primary Case is a high-class, perfect protection for your phone, giving it a great look at the same time. The Case does not unnecessarily thicken the device – its thickness is only 0.3 mm, it is flexible and extremely durable, so you can be sure that your device will always remain like new. One-piece construction Only 0.3mm thick – Thanks to the material (TPU) used, the Case is practically indestructible. – Durable material resistant to abrasion. Easy access to all buttons and ports Perfect fit for your device