Material Safe - Kids sensory chew necklaces made of food grade silicone, and are free of latex, BPA, PVC, Sensory Stimulation - Chewing can promote focus and concentration, our chew necklace can help your child relieve anxiety, reduce restlessness and increase concentration. A therapeutic tool for children with ADHD, SPD, special needs or sensory processing disorders. Medium Firmness - This oral motor chewable teether is gentle on teeth and gums but still very durable for long term use. Our sensory chew collar is medium firm will suit most chewers. For very aggressive chewers, it is not indestructible. Design and size - The design of the chew collar is popular with children. Good size chewies, cords are easy to shorten, just push the cord through the detachable clasp and tie the knot back to your desired length. Due to differences between different monitors, the pictures may not reflect the actual color of the item. Due to manual measurement, please allow slight errors in size.