XXT Clear Chew Necklaces, 5 Pack
Five clear XXT coils with no dye, where a crack shows up as a white line.

Six coil necklaces at the top of the density scale. XXT is the hardest silicone we mix, and the coil is the only format we pour it into.
The coil is a spring of silicone rather than a smooth cord, so it deforms along its length instead of at one point. That spreads a bite out and is the reason the format survives chewers who flatten solid sticks. It also gives the lips and tongue something to run along, which is a different kind of input from biting.
A necklace stays with the child. That is the practical argument for the format over a stick: it cannot be left on a desk, dropped in a playground or forgotten in a coat pocket, because it is round a neck. Six in a pack means losing one is not an event.
Wipe with mild soapy water. The silicone is food grade and works for adults as well as children.
Anything worn round a neck carries a strangulation risk. Check the cord and the join before every use, take it off for sleep and for climbing frames, and do not use it with a child who cannot be supervised.
Silicone that has been chewed for months splits along the bite line, and a torn piece can be swallowed. Bend the chew before each use and look at the creases. Throw it out at the first tear rather than at the first hole.
Same band first, then the shape, then one step either side.
Five clear XXT coils with no dye, where a crack shows up as a white line.
Hand-held chews one density above Xtra Tough, for children who destroyed the last set.
Five sticks at Toughest density, the priciest listing here and the second hardest.
Xtra Xtra Tough: The densest silicone we pour, and the coil necklace is the only shape we pour it into.