The Chewable Diamond Necklace is a BPA free chewable fidget toy ( STIM ) is an excellent stress reliever and sensory therapy tool. Especially useful for children with special needs in autism spectrum. The chewy pencil is a safe and hygienic. With this chewable toy stop nail & pen biting once for all! How this chewable sensory toy works: The chewable brick attaches to pencils to offer oral, tactile and proprioceptive stimulation needed. It allows kids and adult of all ages to safely and hygienically chew, nibble their pencil topper. Chewable Fidget Toy Are Useful for : Kids Children with special needs Sensory stimulation Autism spectrum disorder hyposensitivity General anxiety disorders ADHD Nail biters It can help to reduce / stop : Nails biting Anxiety Stress Model : Green chewable pencil topper brick Made by Robiii HYGIENIC AND SAFE: BPA-FREE Pencil included