These rings can change color at different temperature according to your mood.These color changing emotion rings are made of alloy, durable and nickel-free, and its smooth surface ensures comfortable wear.Made of alloy, it is durable and wearable.There are 4 sizes to choose from: 6, 7, 8.5, 10.Best Choice for Birthday, Anniversary, Holidays, Stocking Stuffers, Graduation, Christmas, Valentine's Day, and any Other Occasion.Item Name: RingMaterial:AlloyStyle: FashionSex: UnisexColor: Random ColorSize Details:Our Size 6: 16mm/0.63" (Approx.)Our Size 7: 17mm/0.67" (Approx.)Our Size 8.5: 18mm/0.71" (Approx.)Our Size 10: 20mm/0.79" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:3 X Three Pieces of Ring