Item Name: Underwater Protection Shell Waterproof Case Diving For Insta360 ONE X2. Color: transparentProduct Name: for insta360 ONE X2 Waterproof Case Protective ShellButton material: siliconeMaterial of connecting shaft between main body and back cover: high hardness 304 stainless steelWaterproof ring material: amorphous high-activity silica gelShell material: high permeability and corrosion-resistant PC/Germany Bayer 2805Packing list:Waterproof shell*1Base*1Screw *1 Waterproof/