Our collagen casings are made from beef Slim Jim *Smart size packaging. Less waste* 21 mm Collagen Casings for making 75 lbs of homemade snack sticks Fifteen strands. Each strand will hold approx 5 lbs of meat. Each strand is approx 25 feet long. 21 mm diameter. Made from beef, edible and much easier to use than hog or sheep casings. Permeable to allow smoke to penetrate when smoking. Great for fresh snack sausage that is going straight to the smoker or in the freezer. Collagen casings are natural, very easy and quick to use. No preperation needed. Just load on your stuffing tube, tie off the end and start stuffing. (3/8" - 1/2" diameter tube needed for this size casings). Store unused casings for up to two years. Do not soak prior to using. Works great with venison, beef, pork, elk, chicken, veal or your favorite game meat. This 21 mm diameter casing is preferred for Slim Jims, Pepperoni Sticks, Snack Sticks and narrow sausages like small breakfast links. Ships quickly from Butcher-Baker. Combined shipping discount available on multiple purchases. Visit our store if you need stuffing tubes, sausage seasonings, meat grinder accessories or sausage stuffers. This size casings works best with a 3/8" (OD) stuffing tube. Available here or at Butcher-Baker.com View our complete store at https://www.ebay.com/str/butcherbaker