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Each Neon Glowring contains a pressurised laser sealed glass tube – a Gaseous Tritium Light Source. (GTLS). This emits a bright neon glow in dark conditions that lasts for up to 10 years, yet it doesn't even need batteries. The glow from a Neon Glowring is visible from up to 20 feet away. It measures 4.5cm and weight: 0.01kg. This version has two Glowing Neon colours of blue and green available in one twin pack.
