Smokehouse Sausage Casings - Our casings are made of non-edible protein fibers to produce a strong yet thin-walled casing that is permeable to smoke and moisture. The casings are elastic and will shrink with the product during the smoking and curing process. They are smoke colored, and produce an attractive finished product.. Directions: Place casing on tube, submerge in cold running water until casing is soft and pliable. After filling, tie loose string ends tightly. Made in Germany. 18-pack. 10" long. 52MM Collagen Casings 18-Pack52 mm/ 10" longNon-Edible Protein Fibers