Cyalume SnapLight, fluorescent signal sticks or markers for marking, are very useful addition to outdoor equipment or accessories for survival. Mandatory as part of each bag to escape (Bug Out Bag). Lightsticks are non-toxic, non-flammable, waterproof and safe for tents. It is very easy to use. Cyalume markers does not produce heat, which makes them totally reliable when used in confined spaces, on clothing or areas where high concentrations of flammable gases. They are excellent for currently general illumination in emergency situations, marking or labeling of key equipment and camps. Each marker has a ring and lanyard, which can be easily and conveniently attaches to clothing, equipment or hang the rope. For each package are printed instructions for use.