Frosskin is a Registered Trade Mark of Phonotronics International Inc with ISO 9001 Certification for it's quality and systems for consistent quality management. All Flip covers are made of very high quality compressed PU leather and magnetic sensors to enhance battery life of your smart phones. All covers are designed in a way so that they match your style and safety of your mobile phones together. Flip Covers have folding feature to hold your Mobile phone horizontally, which gives you easy eccesibility of Mobile screen and firm grip to hold your phone and avoid from any damage on sudden drop from your hand. You do not need to replace back cover of your mobile phone to use this flip cover. You can easily insert your Mobile Phone into the Flip Cover. All Mobile Covers are designed confirming European Quality Standard requirements as well as Eco friendly standards.