Five strands of 21mm Collagen Casings for homemade snack sticks Beef product from the USA. 5/8" filled diameter before cooking Easy to use. Clear to color. Permeable for smoking Each pack will yield approx 25 lbs of snack sausages Requires a 1/2" or 3/8" stuffing tube Five strands of clear collagen snack stick or slim jim casing. Natural beef product from the USA. Slim 21mm diameter for narrow snack sticks. Easy to use. Each strand will fill about 4.5 lbs of meat. Total package yield is about 25 lbs. You will need a slim 3/8" or 1/2" stuffer tube for these casings. A standard 1/2" diameter tube is fine.