I AM Cardboard&reg; Giant Version 50mm Focal Length Virtual Reality Cardboard Kit (Blue) Bigger lenses and Bigger construction for Larger Phones - Inspired by Google Cardboard Asymmetrical Biconvex lenses 37mm diameter and 50mm focal length Complete Kit with NFC, Magnets, Elastic band and Velcro Pre-built and assembled in seconds. Works best on Samsung Galaxy Note 2/3/4, Nexus 6, Oneplus One, iPhone 6 Plus and other same size smartphones. Note: Magnet function does not work with iPhones and other smartphones without magnetometer.