Features: Color change: The color of the ring will change according to your temperature, and fluorescence will appear at night or at the edges of the dark place. High quality: made of high quality alloy, it is not easy to fade , smooth and comfortable, light weight, easy to wear and take off. Universal size: open design, ring size can be adjusted as needed, suitable for most people. Unique gift: give your lover a magical and unique gift for to help you better understand her or his feelings. Multifunction: Perfect for parties, weddings, ceremonies, graduations, dates and careers. Specifications: Material: Alloy Ring Size: Adjustable opening (fixed size 17mm/0.67inch) Note: Please allow 1-2cm error due to manual measurement, please make sure you don't mind before ordering. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Ring