ARK's Mega RoboChew is very similar to the original RoboChew necklace. What's the difference? The Mega version is much bigger!   
The Mega version measures approximately 11.5cm tall, 7cm wide, and 1.4cm at the thickest part. This larger handheld version has over 3 times the weight/bulk of the original RoboChew necklace pendant - great for stronger chewers and/or for individuals looking for something larger.
This chew does not come on a cord by default, but it does have a hole for a cord in case you'd like to add one. Optional breakaway cords can be added here. 
Made in the USA, this chew tool is a safe outlet for anyone who needs to chew, and an effective way to help calm, self-regulate, and focus.