Collagen casings for sausage making are easy to stuff. They are uniform in size and can be used for fresh or smoked sausage. Made of beef protein. This size is great for making snack sticks or hot dogs with your wild game meat. 22 mm x 15 (caliber). Package has 2-49.2' strands in package. Maximum outside diameter of stuffing horn is 14 mm. Stuffed diameter is 23 mm. Recommended horn size for automatic twist linker: 12 mm. Approximate capacity of each strand of casing is 13 lbs. Clear in color. Made in the USA.