FidgetWorks Bike Chain Fidget Toy for Autism, ADD, ADHD, Stress and Idle Hands, Black Helps to lower stress & anxiety at home, school or the workplace. Smooth rolling & twisting movement for quiet and discrete fidgeting! Durable silicone rings & rust resistant parts ensure this fidget will last you years. Proudly built in the USA with 1 year warranty. Interlocking rings will provide hours and hours of fidgeting.