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Blackett mini glow sticks are perfect for throwing into small survival kits, taking on backpacking or caving expeditions, and to have around the house in case of a power outage. Despite their small size (About 1.5" long), they cast enough light to find your way around in the dark, to read maps and books, and to use as markers or breadcrumbs to find your way back in dark environments. Each marker will glow for several hours.