Glowing Green Lantern ring. Designed to fit three 1.5x3x9 flat tritium vials.
Shapeways only produces the rings. you'll need to source the tritium. I've provided vial size info in the description of the rings. Please educate yourself on the potential health risks of tritium and the import restrictions for your respective country. May I sugest http://www.physics.isu.edu/radinf/tritium.htm Thanks for your interest -Jarvis