Splaks AP003 Google Cardboard V2.0 3D Glasses Virtual Reality DIY Kit, Black Complete Kit with detailed instructions and easy to follow for installing numbered tabs; Biconvex lenses 37mm in diameter and Focal length 45mm (exact google cardboard specification) New and High Quality Google Cardboard V3 Magnetic Control; Compatible with Android, iPhone and Google phones, changes common videos into 3D movies; High quality and amazing advanced technology.