Caution! Splinters in filling
From product's description: "Geen splinters, omdat de botten uit één heel stuk runderhuid zijn gemaakt".
This is actually not true!
The outer layer of the bone is indeed made of rawhide, but the inner filling is just a compressed mass of small splinters! Once your dog chews through the outer layer all room is covered in these sharp small particles. Most of them will be in your dog's stomach, of course.
They cannot be good for the animals, my dog got diarrhea for several days after eating this.