Sensory Ring Made of high-quality stainless steel with an anodized coating, strong, durable and safe, spiky finger ring can be used for a long time Quiet sensory rings fidget toy, use for the classroom, home or office, for parents, teachers, students, therapists etc Great fidget sensory toy for all children ages 3+ and adults, especially for those with ADD / ADHD, OCD, autism, or high anxiety levels Note: Since it is not a welded joint, if you pull hard and the joint buckle is unstable, it will become a straight line, you only need to re-fasten it and then reuse it after two rotations