King Will Nature Mens 8mm Tungsten Carbide Ring Inlaid Luminous Bottom Paper and Silver ECG IDEA: Unique luminous ring, glow in the dark, made of safe and eco-friendly material. STEP: Take the ring in the sunlight or flashlight a few minutes(let it catch more light), it will bright a lot. Electrocardiogram pattern, ideal gift for wedding, engagement, anniversary and all occasions. King Will's jewelry box, save your giftwrap service fee, and help you store the ring much safer and longer. If you have any question, please post it in the part of "Customer Questions & Answers" below the page, you will get the answer by us or buyers as soon as possible