<p>Specification: Product name: 3x22.5mm Trit Vials Material: Tritium gas Waterproof: 100m light range:7-8cm Color: green,red ,blue Weight:5g Size: 3x22.5mm Quantity:1pcs Features: Glows continuously for 15 years Bright and visible unique clear white glow Completely contained and self-powered Perfect for space flight and aviation,instrument,war industry and collimator.Or decorations,horologe,luxury and glasses. Package included: 1 x 3x22.5mm Trit Vials</p>