Feature: This type of color change mood ring can perceive your temperature and test your mood. It is sensitive to temperature, so when your mood change,your body temperature may change with your mood. Different color represents different mood. Perfect for best friend gift. Warmly Tips: Please keep products away from water. Mood stone will lose it's function if submerged in water; Mood stones are also fragile, please use with care Material: Alloy,Feeling warm piece. Size: Diameter: 17 mm/ 0.67" Open Design, adjustable, suits for US Size 5-10. Color:As Picture Show. Quantity: 1 Pc. Note: Size for manual measurement, there may be a 0 to 2 cm error, belongs to the normal phenomenon. And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 PC X Ring .