Sausage has been manufactured in natural casings since centuries. The casings constitute the oldest "wrapping" for sausage. They are distinguished by a number of advantages, which make them undisputable for the manufacturing of sausages:
neutral in taste
good smoking properties
firmness/crispness in bite
conducive to maturity process
environmentally compatible

These advantages have the result that natural casings invariably enjoy a high popularity, in spite of the availability of artificial casings. This is verified by a market research of the GFK:
"Suppliers of sausage in natural casings are market oriented."