1、Durable Material: Using optical glass, coated hard plastic, aluminum anodized film material, sturdy and durable. 2、M67 Thread Adapter: Suitable for all SLR or camera waterproof cases with 67mm/6in interface. 3、Compression Resistance: Compression depth 60m/196.9ft, can be used for underwater photography sports such as diving and snorkeling. 4、Fisheye Lens Cover: Multipurpose lens cover designed for fisheye wide angle lens, which can be installed on various SLR and mirrorless series waterproof shells. 5、High Light Transmittance: Optical glass and anti reflection coating design makes the image quality undistorted and the image quality is good. Spherical diameter of 110mm/3in gives it excellent edge image quality, which is the choice of users who pay attention to image quality. 1 x Fisheye Lens Cover2 x Pack Anti Fog film1 x Manual  Item Type: Fisheye Lens CoverColor: As Pictures ShownMaterial: Optical Glass + Plastic + AluminumWeight: Approx.524g/ 18.5ozInterface: M67 Threaded InterfaceAmplification Coefficient: X 0.7 (Underwater)