The cat prefers something else
The cat prefers other balls; these ones also broke apart very quickly when they came into contact with claws and teeth. As a result, they started to split and tear, which is a big problem because the cat tried to eat pieces of the ball. Luckily, I managed to get them out of his mouth, but if I hadn’t been home, it probably would have meant a trip to the vet and blocked intestines... On the plus side, they are quite big.