This color changing ring is durable and holds its shape well, and it does change color according to temperature. Its smooth surface ensures it's comfortable to wear, bring you a nice wearing experience. A perfect your loved one on holidays, Halloween, Christmas, birthdays, anniversaries, etc. Features -Color:Assorted Color -Material: Copper -Size: 2.00X2.00X0.60cm/0.79X0.79X0.24 in. -Inner Ring Diameter: about 16mm/17mm/18mm/19mm/20mm - This ring can match your most outfit and show your personality, add this mood jewelry to your collection. - Creative design. This mood ring can change the color along with the temperature change. - This color changing mood ring is a great jewelry for you to wear on daily life or special occasions. - Change color in response to different temperature, this color changing ring is funny and interesting. - Provide rich quantity for you to use or share them with your kids, friends or family. Package list: 10 x color changing rings (16mm) 10 x color changing rings (17mm) 10 x color changing rings (18mm) 10 x color changing rings (19mm) 10 x color changing rings (20mm)