5-pack 21mm clear collagen casings for snack stick sausage Beef product casings. USA product Casings will fill approx 25 lbs of meat per pack. 21mm casings will dry to be about 3/4" diameter. Very popular size REQUIRES a 1/2" or smaller tube. 5 strands of clear 21mm collagen casings for homemade snack stick or slim sausages. Easy to use. Each strand will fill approx 4.5 lbs of meat. Total package yield is approx 25 lbs of sausage. These casings are from permeable for slow smoking or oven cooking before eating or freezing. 21mm casings will REQUIRE the 1/2" (12mm) stuffer tube. Finished product is a thin snack stick sausage about 3/4" diameter. Beef casings product from the USA.