I don't like the collagen casings. Th only time I use them is for larger diameter stuff such as Summer Sausage. You get a far nicer end product from a natural casing I find. Better 'snap', better moisture retention, easier to use, stronger, easier to link and far more forgiving than any of the collagen casings I've used. And the natural curve of the gut gives you a far better-looking sausage into the bargain