1, Chew, 3 Stretch & Play Made from quality BPA-free material Sensory Spark "Excellent product for special need children. My son has sensory processing disorder and other issues that cause him to be quite the chewer and bite his nails. I was afraid they would be too sturdy and got the medium durability option, but it has proved to be the perfect match. Tough enough to withstand his nibbling, but soft enough to give him a little bit of bend with his bite. Surely, they do not last forever, and I will be back to purchase more in the future." - Orly C. SAVE YOUR CHILD'S SHIRT SLEEVES: This chew stimulation toy will capture your child's attention, thereby saving shirt sleeves.