Crystal HD Double-Sided Mirror Head - #4 (22mm dia.) Assorted Neon Colors 4/Pk. 40% brighter than rhodium mirrors. More scratch resistant. Reduces eye strain and fatigue. Lens is flush with mirror frame, eliminating the possibility or corrosion build-up. Eliminates galvanic shock. Autoclavable up to 136C/275F. Contains Antimicrobial Protection. Box of 4 mirrors