40mm (1 5/8″) x 18″ Rounded Collagen Casings10 Pack. Pre-Tied. Each Casing Holds Approx. 1 lb. of Sausage. Want to make ring bologna, kiszka, holsteiner, ring liver sausage or a quality knockwurst and minimize casing-loss due to bursts and ensure a consistent diameter everytime? We now have a collagen casing that curves into a perfect ring/loop. Comes pretied on one end for convenience and added efficiency. Non-edible.