Ninny is an awesome fidget for many reasons but it's the center link that makes it unique and an instant fidget favorite. Unlike any other fidget, Ninny has 8 silicone rings that roll smoothly, providing great fidget feel and fluidity. Use Ninny to help reduce stress, anxiety and symptoms associated with ADD/ADHD, Autism, nail biting, hair twirling, leg bouncing, etc. Go Ninny Go! Ninny comes in three different sizes; regular, mini and jumbo.