The bicycle-tape, and the mastic, and the dozen other devices for mending punctured tires are all very well in their way, but they are not absolutely reliable.
A punctured tire is a wounded tire, and needs the aid of a bicycle doctor. All attempts at doing one's own surgery are likely to fail for the simple reason that we are not experts in the business, and do not always understand the extent of the damage.
The leak-stopper is merely a bandage to be applied to the wound till help can be found. It consists of a strap of flexible material, provided at one end with a buckle and at the other with a pair of tongues.
On the inside of the strap is some flexible air-tight material partly fastened to the strap, and so arranged that it will entirely cover the lips of the wound.
The edges are covered with adhesive material, and are firmly pressed on either lip of the wound, drawing it together and covering it with air-tight material, so that no air can escape.

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