Unique Ecg Heartbeat Ring which Glows in the dark by absorbing light. It's the little things that keep the romance going strong. Material: 100% high-quality Titanium steel. The Luminous Titanium steel ring does not tarnish. It has a unique feature in that It does glow in the dark PREMIUM QUALITY: Pure surgical stainless steel is used to make this product, which doesn't cause any harm to the skin. Nickel-free and Lead-free as per International Standards.