Discover Endless Fidgety Fun with Senso Rings: Flex, Stretch, and Engage! These Senso Rings are flexible and stretchy, bringing a new level of fidgety fun into your world. Made from non-toxic, BPA-free, and hypoallergenic thermoplastic rubber, they're designed for your safety and enjoyment. With three different firmness levels, there's a Senso Ring for every fidget enthusiast.