Compatible with Hero 3 and Hero 2 * Made of high quality polycarbonate * The adhesive mounts are made with 3Madhesive; 3M"s innovative VHB 4991 adhesive backing ensures the mounts stay put * The flat adhesive mounts can be removedeasily when heat is applied such as hair dryer; Curved surface especially for helmet use * Package includes:- Curved Mount x 2; - Flat Mount x 2; - 3M VHB Sticker x 4