Zirc Offers The Most Brilliant And Quality Mouth Mirror Lens On The Market Today. The Crystal HD Mirror Lens Is 40% Brighter Than Rhodium And Reduces Eye Strain And Fatigue Lens Is Flush With The Mirror Frame,Eliminating The Possibility Of Corrosion Build-Up. Features 40% brighter than rhodium mirrors Reduces eye strain and fatigue Lens is flush with mirror frame, eliminating the possibility of corrosion build-up Eliminates galvanic shock Autoclavable up to 136°C/275°F Contains Antimicrobial