I'm selling this because I accidentally bought the wrong size. I only tried it on my finger once. It has a double structure and can be spun like a fidget spinner. You can spin it slowly, or flick it with your finger for a fast spin. This product is US size 12, which is approximately size 28 in Japan. I measured it and it's accurate to the size listed. Fidget rings are recommended for relieving stress and anxiety, maintaining focus, preventing skin picking, and as a measure for developmental disorders such as ADHD. Men's / Hand Spinner / Fidget Toy / Hand Gum / Mindfulness / Obsessive-Compulsive Disorder / Tension Relief / Anxiety Relief