Radiance Plus™ is the clearest ceramic twin bracket available, proven to be much clearer than other monocrystalline or polycrystalline ceramic systems. Each Radiance Plus™ bracket is created from a single crystal of pure grown sapphire – one of the hardest materials in nature, second only to diamond. The crystal is honed and heat polished into a remarkably strong and beautiful bracket that's nearly invisible on the teeth. A recent study appearing in the American Journal of Orthodontics and Dentofacial Orthopedics rates Radiance Plus™ as the most translucent of all monocrystalline brackets test