I wish I knew metric better but I had no idea that this was such a little shoe for the money. On the plus side it seems quite sturdy for my aggressive chewer. But the more logical price for this would have been 5 bucks.This was my Bully's favorite new toy by far. However, pic is deceiving its a super small toy, not for larger dogs with big mouths. However, my big guy loved it! It was not as durable as it was made out to be either and I had to cut off the back of the shoe to protect him cause he was about to dislodge a piece chewing it only after a few days.Within the first hour my dog had pieces chewed off the heel. Super cute and my dog loves it… I just hope she found the one weak spot and it lastsI don't like that it cost so much money for just one small toy that doesn't even squeak but I love that it has not been shredded yet because my little dogs shred almost every toy that I have gotten them in less then 24hoursGreat for teething puppiesVery durable toy! My pup is a fanVery small toy, very rigid, and as has a plastic smell, my 19 week old puppy shows very little interest. It is heavy to be small and so dropped a lot, and seems to hard to actually "chew". My greyhound a shoe thief-but not this one.