English: A: Typical outer casing of a tire made of Sea Island cotton impregnated with rubber, with more durable rubber used in outer tread. B: Continuous, one-piece, or open-end inner tube assembly, where first a joint is made where one end slips into the other, with the collar member forced out tightly against the inner face of the retaining member. C: A butt-end tube, where the the tapered, closed end fits into the open end, expanding to seal when inflated.