This 4.25" x 2.75" acrylic mirror is virtually unbreakable and weighs 1.8 ounces.  Designed to provide optimum sighting "spot" with holographic red dot and features telescope quality reflective surface.  Operates on the same principle as the glass military signal mirrors with grid/fireball targeting.  Mirror includes USCG approved whistle, attached lanyard and float for recovery if dropped in water.  Click here for sighting pictorials.