Natural collagen casings from beef for snack sticks. These are the NARROW 17mm size that is preferred by many. Each pack will hold approx 23 lbs of meat. Smart packed. 5 strands that will stretch out 45 ft each. Store unused casings until next season. These casings REQUIRE a slim 3/8" (9 or 10 mm) to fit on. Smokehouse Chef also has the tube if you need it to fit manual sausage stuffers. Add them to your cart now for combined shipping. USA product