These ARK Krypto-Bite™ Chewable Gem Necklaces provide a safe, wearable, and discreet solution for people who need to chew. Use as an oral fidget to help calm, soothe, and self-regulate during times of stress. Particularly effective for children with autism, ADHD and sensory needs. Has adjustable breakaway cord. Gem chew Length: 8cm x 2cm.