"Strong tubes (1/2"" diameter) are super tough and can take very aggressive chewing. Give your child a better choice and save clothing, pencils, toys and other things from getting chewed up. Strong tubes are made of BPA-free, pthalates-free, lead-free, PVC-free, latex-free, non-toxic materials. They are top rack dishwasher safe. Increase focus, attention, and allow your child to self regulate in a discreet manner. Strong tubes on navy tether holder with snap hook clip allows your child to keep the strong tube clipped to their shirt collar or shoulder for quick and easy access. Chubuddy stands behind all strong tubes with our exclusive 90 day, no-chew-through warranty. We want you to be completely satisfied with your purchase and we stand behind our products. " Warranty is limited to normal wear & tear--does not cover intentional misuse or damage to product.