My 4 year-old son (who has ASD / SPD) is a chewer non pareil. We have tried all (and I do mean ALL) the chewies out there, and this Chew Stixx has proven the most durable. Even still, they only last about two weeks (that kid must be part-shark!), but that's such an improvement over all the other chewies we've tried. He likes the length of the stixx because he can really shove it back there and use his molars (which soothes his system). The price here is *by far* the best out there, even when you add in S&h. I have researched like mad! We attach this stixx to a ChewEase (we remove the aquarium tubing part and cut down the coil b/c the Stixx is heavy so will pull it way down), so it's always attached to his clothing so he always has chewing access.