VR-Room Google Cardboard 3d Vr Virtual Reality 3D Glasses DIY Kit for Smartphone 3.5--6 Inch Screen- Easy Setup(black cardboard ) Complete Kit with detailed instructions and easy to follow for installing numbered tabs Biconvex lenses 25mm in diameter and Focal length 45mm (exact google cardboard specification) New and High Quality Google Cardboard Magnetic Control Compatible with Android, iPhone and Google phones, changes common videos into 3D movies; Compatible with 3.5"--6"smartphone up to 85mm width phone.