Glow rings and new power glow keyringsr traser glow rings power rings or glowrings are fantastic glowing keyrings that utilise new technology enabling it glow in the dark for over 10 years without batteries or rechargingr r glowrings are filled with a special gas tritium housed in a high density borosillicate glass shell that measures approximately 5cm attach glow rings or the new power ring to anything and let it glow and be seen in the dark a very handy and practical glow in the dark ke