Lining

At the left different types of tubes and liner: a) unlined, b) plastic with linier, c) colored plastic with colored liner, d) lined brass, e) polished brass, f) rear tube with liner/inner tube and g) a bottle with liner. To the right the process of lining: 1) burn a rear collar, 2) mount the liner, 3) pull tight, 4) trim and 5) burn a front collar.