StarFlashÆ Ultra is the latest advancement in signal mirror technology. It is over 90% as reflective as glass, yet boasts features you won't find with traditional glass signal mirrors. Unbreakable, scratch resistant, and floats! Even on overcast days, you can effectively use this signal mirror to obtain rescue. StarFlashÆ Ultra signal mirror can help you be found, and can save your life. Micro Mirror is the compact version of the Signal Mirror. Dimensions: 2" x 3" (Signal Mirror), 1.5" x 2" (Micro).