Tinksky Mood Ring Adjustable Smiley Face Color Change Emotion Feeling Finger Ring Material: Alloy. Ring inner diameter: Approx. 17mm(unstretched). Size: US size 7 / UK size O. Smiley diameter: Approx. 1.5 cm. Adjustable size, suitable for both men and women to wear. Delicate and sparkling color changing designed on the ring to make it more charming. A simple and romantic women's finger ring for your friend or lover.