ARK's Krypto-Bite® Chewable Gem Necklace provides a safe, wearable, and discrete solution for kids and adults who need to chew. The stylish crystal pendant is sure to be a hit for all ages and genders. Use this "chewelry" as an oral fidget (or even hand fidget) to help calm, soothe, and self-regulate during times of stress, or to better focus during homework and other activities.ARK's Krypto-Bite comes in 3 color-coded toughness levels:Soft/Standard= The chewiest, recommended for mild chewing onlyXT= Firmer, but still chewy, for mild to moderate chewingXXT= The most firm, recommended for those who like to chew on firm / fairly rigid items. This is also the longest lasting level for avid chewing.Details:Each pendant is sold individually with its own breakaway necklace cordDesigned, manufactured, and assembled in the USA by ARK TherapeuticEach pendant is medical grade, FDA compliant, and contains NO lead, phthalates, PVC, BPA, or latexEach pendant measures 3 inches in length and .5 inch in diameterThe cord me