This was a gift for a 3 year-old grandson with a yet to be diagnosis for either autism, sensory disorder or small vessel disease. He is a nonverbal, cheerful boy, who has been chewing on all he can get into his mouth. His dad said he seemed to enjoy looking into the Kaleidescope, but then started chewing on it. I continued a search on your website and discovered the chewy necklace...it is on the way to him now!