The Nitestik Safety Marker lasts for up to 10 years & will glow for up to 12 hours in darkness. Ideal for marking anything you wish to locate in the dark, the Nitestik Safety Marker is great for attaching to your camping gear – attach to your tent, rucksack, sleeping bag, mallet, tent pegs, attach to your fishing gear or your keys, even your pet’s collar! The Nitestik Safety Marker is great for marking almost anything you want to locate in the dark.