For aesthetic anterior and metal posterior bracketing. Manufactured from pure monocrystalline material. Developed from a single crystal sapphire - one of the hardest and clearest materials found in nature. Once machined, the brackets are annealed for strength and heat polished to perfect microscopic flaws. Virtually invisible appearance allows the natural tooth colour to show through. Features Crunch COAT Base and anatomically contoured base radii providing excellent performance. Rounded corners with a single hook for a less bulky feel than universal hooks. Stain resistant. Non-allergenic for senstitive patients. Colour coded for easy identification. With Hooks on 3s, 4s, 5s, Quick Pac (20 Brackets).