cHu-buDDy tubes are made from an NSF 61 compliant, non-toxic material that is BPA-free, pthalates-free, latex-free and lead-free. They also come with an 8" tether that makes it easy to attach to clothing and makes it harder to lose! Clip the buDDy tube on or wear as a bracelet. cHu-buDDy tubes are made for moderate to aggressive chewers. The buDDy tube is 1/2" in diameter and is an ideal chew for children with autism and other sensory needs.