Type  : XiaoMi Mi4 Material: PU natural silk pattern ( Outer Case )  Smooth line stereo design and innovative style makes it look elegant and soft hand feeling. High Quality PC Material Environmental Friendly ( Back Cover )  Ultra-thin breathable， soft， full of perfect protection， make your phone unique style Unique voltage technology， Synthetic leather， corner flat， delicate appearance， texture clear and can be cleaned Flip cover with touch screen window.