Our Silver Slot Bracket System is fully translucent for that "natural look". Made from the purest polycrystalline alumina, a material with properties similar to those of a diamond, the hardest substance known to man that provides a strong bracket which resists breakage. Compound contour and torque in base design for a precise fit and precise tip, torque and in/out movements. Contoured auxiliary hooks enhance patient comfort. Mechanical dovetail grooves, porous surface.