Luckily our school is very accommodating, so he can wear it all day. They are really difficult to chew through and easily handle the punishment a young boy can hand out.
The brick buddies are the same length as the bricks, but slightly more bulky and definitely harder, with more resistance. They are made from food-grade silicone and approved by the FDA in the US, so safety is not a concern if some of it is accidentally swallowed.
Please remember that chewable necklaces are not indestructible - please read our guide to selecting the right chewable here before you make your selection.