RoboChew™ Sensory Chew Necklace is sure to put a smile on your face! At 2.5" tall, .7" wide at the feet, and .5" thick, this chewable robot pendant is a great option for those who prefer chewing with their pre-molars and/or front teeth. It features lots of tactile ribs and bumps for extra sensory input through texture. Use this oral sensory solution as a safe alternative to chewing on pencils, shirts, fingers, etc. and to help calm, focus, and self-regulate. Toughness Guide: Standard - This is the softest level, recommended for mild chewers (those who do not chew through anything). XT / Medium Firm - This is the middle level. It's firmer, but still fairly chewy, recommended for moderate chewers. XXT / Very Firm - This is the toughest level. It still has some “chewability” to it, but it’s fairly rigid / pretty firm. No chew tool is indestructible, but this is usually the longest lasting level for avid chewers.